Existing Property Gutter Audit - European Gutters - Superior Form … Property Gutter... · 2020. 4. 20. · 1 Existing Property Gutter Audit Executive Summary; Page 1 to 2 Rotten

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Existing Property Gutter Audit

Executive Summary; Page 1 to 2

Rotten Fascia & Wallboard Issues; Pages 2 to 4

Re-Roofing, Exposed Fascia Board Issues; Pages 5 to 8

Blocked Gutter Issues; Pages 9 to 11

Replacement Gutters, Exposed Fascia Board Issues; Pages 12 to 16

Gutter Maintenance Issues; Pages 16 to 19

Building Code Gutter Capacity Review; Pages 19 to 20

European Gutters Value Proposition; Pages 21 to 25

European Gutters Lindab Installations; Pages 25 to 29

Building Code, Industry & RMA Support Documents; Pages 30 to 32

NZ Gutter Capacity Specifications; Pages 33 to 37

Executive Summary European Gutters are the New Zealand and Australian Distributors of Lindab Rainwater Systems. Lindab Gutters have been made in Sweden since 1956 and offer homeowners and property managers the highest quality solutions when it comes to superior drainage capacity, extreme weather performance, overflow functionality, self-cleaning gutters and downpipes, safe and cost effective maintenance systems, enhanced durability, range of components, ease of installation, aesthetics and environmental considerations. In addition, unlike New Zealand manufactured gutters, the European Gutters rainwater system fully meets the requirements of the New Zealand Building Code and Resource Management Act. European Gutters sells its products to Builders, Roofers, Plumbers and Homeowners on a nationwide basis from warehouses and depots in Auckland, Hamilton, Hastings, Wellington and Christchurch.

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A gutter audit of existing properties has identified damage caused by poorly functioning rainwater systems. This damage has been caused by a range of factors including a Building Code short fall in downpipes, blocked Gutters & Downpipes and exposed Fascia Boards. The audit has also identified that European Gutters high capacity Lindab 150mm gutter and In\Out Debris Diverters will address these various issues.

Rotten Fascia and Wall Boards Blocked gutters and heavy rainfall can lead to overflow issues. Well-designed rainwater systems will incorporate overflow measures to ensure that water flows away from the property, as required by E2/AS1 8.1.6(f). When water frequently overflows the back of the gutter it can damage fascia, wall boards and soffits.

2016 Audit Bell Street, Hamilton Audit Commentary:

The position and design of the original gutter allowed water to flow back over the gutter and into the wall cavity. In addition, the downpipes on this property had not been connected to the storm water and had been left to run into the soil.

2018 Audits Ivon Road, Otara

Audit Commentary:

It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on this roof and exposed the fascia board to water damage. The internal brackets on the gutter make it hard to maintain, which is a warranty requirement for both steel and plastic gutters

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Brougham Place, West Harbour Audit Commentary:

It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on this roof, over rotten timber, and continues to expose the fascia board to water damage. The property is in an area with mature trees and the internal brackets on the gutter make it hard to maintain.

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Wilkinson Avenue, Kamo Audit Commentary:

It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on the roof. As a result, the fascia board has been exposed to water damage. There is also insufficient fall in the gutter and it is holding water, which exasperates the overflow and water damage issues. The exposed fascia board, insufficient fall and the capacity of the 125mm gutter have all contributed to the fascia board rotting over time.

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ReRoofing – Exposed Fascia Boards The re-roofing of concrete and metal tile roofs in longrun results in the roof sitting slightly higher due to the requirements of the Building Code. This will expose the fascia to wind driven rain and can cause roof water to over shoot the gutter. Over time this will result in damage to the property and can create H&S issues over pathways.

Palmer Avenue, Glendene Audit Commentary:

The original metal tile roof was installed using 50mm x 25mm battens. When re-roofing these roofs the Building Code requires that these battens must be replaced with 50mm x 75mm purlins. Because the new steel roof has greater water flow and sits higher, the water no longer flows cleanly into the 125mm gutter and risks overshooting onto the ground below or being blown back on to the fascia board. This will result in water damage to the property and can create H&S issues over pathways.

Lenderfield Dr Papatoetoe Audit Commentary:

The metal tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. As a result, the fascia will be exposed to wind driven rain which will result in water damage to the property. The higher roof can also create H&S issues over pathways.

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Doreen Ave Mt Albert Audit Commentary:

There are 4 units located at 7A Doreen Avenue. Two of the units have been reroofed and two have not, thereby creating a site specific “before & after” scenario. The original concrete tile roof was installed using 25mm x 50mm battens. When re-roofing these roofs the Building Code requires that these battens must be replaced with 50mm x 75mm purlins. Because the new steel roof has greater water flow and sits higher and further out, the water is at risk of overshooting the 125mm gutter or being blown back on to the fascia board. This will result in water damage to the property and can create H&S issues over pathways.

Bolton Street, Blockhouse Bay Audit Commentary:

The concrete tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. As a result, the fascia will be exposed to wind driven rain which will result in water damage to the property. The higher roof can also create H&S issues over pathways.

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Wordsworth Road, Manurewa Audit Commentary:

The metal tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. As a result, the fascia will be exposed to wind driven rain which will result in water damage to the property. The higher roof can also create H&S issues over pathways.

Tiaka Place, Pakuranga Audit Commentary:

The metal tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. This will expose the fascia to wind driven rain and cause water damage to the property. In addition, the gutter is falling away from the fascia board on this property due to the failure of the fixings. This can happen when gutters are overloaded by debris, heavy rainfall and blockages.

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Kerrydale Road, Manurewa Audit Commentary:

The concrete tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. This exposes the fascia to wind driven rain and will cause water damage to the property.

There is also a risk that the water will overshoot the 125mm gutter.

Smiths Avenue, Papakura Audit Commentary:

The metal tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. This exposes the fascia to wind driven rain and will cause water damage to the property.

Middlemore Crescent, Papatoetoe Audit Commentary:

The concrete tile roof on this property has been changed to a longrun roof and it now sits slightly higher due to the requirements of the Building Code. This exposes the fascia to wind driven rain and will cause water damage to the property.

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Blocked Gutters Blocked gutters and heavy rainfall will lead to overflow issues. Well-designed rainwater systems will incorporate overflow measures, such as gutters with a lower front, to ensure that water flows away from the property. When water frequently overflows the back of the gutter it can result in water damage to the property.

2016 Audit Cumnor Terrace, Christchurch Audit Commentary:

This Duplex was built in 2014 and only had one downpipe per property Blocked gutters will lead to overflow issues. The front of this gutter is higher than the back and water can flow back on to the fascia board. The internal brackets on the existing gutter make it hard to maintain, which is a warranty requirement for both steel and plastic gutters.

2018 Audits Ixia Pl, Wiri Audit Commentary:

Blocked gutters will lead to overflow issues. The front of this gutter is higher than the back and water can flow back on to the fascia board. The internal brackets on the existing gutter make it hard to maintain.

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Maroa Rd, One Tree Hill Audit Commentary:


Tairere Crescent, Rosehill Audit Commentary:


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Redcrest Ave, Red Hill Audit Commentary:

The primary issue with this concrete tile to longrun reroof is ongoing maintenance due to the number of mature trees in the area. In addition, the internal brackets on the existing 125mm gutter make it hard to maintain.

Cranbrook Place, Glendowie Audit Commentary:

The primary issue with this concrete tile to longrun reroof is ongoing maintenance due to the number of mature trees in the area. In addition, the internal brackets on the existing 125mm gutter make it hard to maintain.

Dawson Road, Otara Audit Commentary:

The primary issue for this “new build” property is ongoing maintenance due to the presence of mature trees in the area. In addition, the internal brackets on the gutter make it hard to maintain and blocked gutters will lead to overflow issues. The front of this gutter is higher than the back and water can flow back on to the fascia board.

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Replacement Gutters – Exposed Fascia Boards Poor installation & placement of the gutter will expose the fascia to wind driven rain,

increase the likelihood of blockages and cause roof water to over shoot the gutter. Over

time this will result in water damage to the property and can create H&S issues over

pathways.

Camden Avenue, Waterview Audit Commentary:

The replacement gutter has been replaced in-situ and the fascia is now exposed to water damage. The fascia board will be further exposed when the existing roof is replaced with a longrun roof, which sits slightly higher due to the requirements of the Building Code. It is likely that the drainage issues on this property are caused by a combination of gutter carrying capacity, blockages and a shortfall in downpipes.

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Longburn Road, Henderson Audit Commentary:

Metal tile roofs require a minimum 50mm overhang into the gutter. It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on this roof. As a result, the fascia board is now exposed to water damage.

Burbank Avenue, Manurewa Audit Commentary:

As per the photo in the Commentary Box the original gutter sat higher and flatter against the fascia board. As per audit the photo (to the left) the gutter has been replaced in-situ. As a result, the fascia board is now exposed to water damage.

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Crispian Place, Weymouth Audit Commentary:

This property has had an extension built on to it and the new gutter has been run along the addition, at the same height as the gutter on the existing property. This has exposed the fascia to wind driven rain and will cause water damage to the property. In addition, the water run off over shoots the gutter on this section of the roof.

Archboyd Avenue, Mangere Audit Commentary:

It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on this roof. As a result, the fascia board is now exposed to water damage.

Glendene Avenue, Glendene Audit Commentary:

It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on this roof. As a result, the fascia board is now exposed to water damage.

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Hillside Road, Papatoetoe Audit Commentary:

It is likely that the original gutter sat higher and flatter against the fascia board. The replacement gutter has been replaced in-situ on this two-storey roof. As a result, the fascia board is now exposed to water damage.

Springleigh Avenue, Mt Albert Audit Commentary:

The original concrete tile roof was installed using 25mm x 50mm battens. When re-roofing these roofs the Building Code requires that these battens must be replaced with 50mm x 75mm purlins. Because the new steel roof has greater water flow and sits higher and further out, the water is at risk of overshooting the 125mm gutter, which can create H&S issues over pathways.

Ramsgate Terrace, Mairangi Bay Audit Commentary:

It is likely that the poor design of the roof / cladding juncture has resulted in the concentrated wetting of this area and caused the cladding to rot over time. In addition, the internal brackets on the existing 125mm gutter make it hard to maintain.

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Johnstones Road, Otara Audit Commentary:

The “drop” in this PVC gutter exposes the fascia board to wind driven rain and water damage. It also compromises the free flow of water and leads to the build-up of debris, which can cause blockages. These sorts of problems are generally caused by bracket placement or failure issues.

Gutter Maintenance Issues High capacity gutters with external brackets allow water to flow more freely which helps to eliminate the build-up of debris. Blocked gutters and downpipes will lead to overflow issues which can cause water damage to the property.

Morrie Laing Avenue, Mt Roskill Audit Commentary:

It is likely that the warping of the gutter on this two-storey property is a combination of several factors including the distance between the brackets, the number of joins, the hot Auckland sun and exposure to high winds. The internal brackets on the existing gutter make it hard to maintain, which is a warranty requirement for both steel and plastic gutters

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Fairdale Avenue, Redhill Audit Commentary:

Blocked gutters will lead to overflow issues. The front of this gutter is higher than the back and water can flow back on to the fascia board. The internal brackets on the existing gutter make it hard to maintain. Gutter maintenance is particularly advisable in areas with mature trees and is necessary in the event of plant growth.

Everitt Road, Otara Audit Commentary:

The internal brackets on the existing 125mm gutter make it hard to maintain. Gutter maintenance is particularly advisable in areas with mature trees and is necessary in the event of plant growth.

Solo Place, Manurewa Audit Commentary:


London Place, Pukekohe Audit Commentary:


Valentine Street, Papakura Audit Commentary:


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Rowandale Avenue, Manurewa Audit Commentary:

The metal tile roof on this property has been changed to a longrun roof. The internal brackets on the existing 125mm gutter make it hard to maintain.

Jack Farrell Place, Red Hill Audit Commentary:

There is no effective way to clean the internal gutter system on this property.

Dosina Place, Flat Bush Audit Commentary:

There is no effective way to clean the internal gutter system on this property. It is likely that the damage to the soffit has been caused by gutter overflow issues.

Greenhaven Avenue, Opaheke Audit Commentary:

The roof overhang on this roof means there is very limited room in which to clean the 125mm wide gutter. The internal brackets on the gutter also make it hard to maintain.

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Murray Rd, Otara Audit Commentary:

The concrete tile roof on this property has been changed to a longrun roof. Wind driven rain from the copper spouting can result in the galvanic corrosion of the newly installed zincalume roof.

Otara Road, Otara Audit Commentary:

The concrete tile roof on this property has been changed to a longrun roof. Wind driven rain from the copper spouting can result in the galvanic corrosion of the newly installed zincalume roof.

Building Code Gutter Capacity Review An audit of fifteen representative existing properties found that there was insufficient roof drainage on most of these properties due the carrying capacity of the 125mm gutters. In heavy rainfall ineffective gutter and downpipe systems can result in gutter overshoot issues and will result in gutter overflow issues, which can lead to water tracking back into the building and the concentrated wetting of the property. The audit, which was carried out by an Independent Consultant, noted that a 150mm gutter would address the Building Code roof drainage issues on many of these properties, due to their greater capacity to move water away from the dwelling. The installation of additional downpipes would also address the roof drainage issues.

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A cross section of the Audit Properties

Building Code Gutter Capacity Review

If a larger gutter did not address the Building Code shortfall in roof drainage capacity the number and location of the downpipes would need to be reviewed.

Gutter Drainage Capacity Audit

(based on a 10 year NIWA Auckland average rainfall of 100mm per hour) Stormcloud Lindab

M²/dp OK if SC M²/dp OK if Lnb

Address Type Area Pitch No DP lm gutter eave m²/DP

2/11 Oratu Place Manurewa Simple gable 118 17 2 28 14 59 45 Fail 81 Pass

11 Gaye Cres Otara Simple gable 116 25 2 25 12.5 58 45 Fail 81 Pass

133 Weymouth Road Simple gable 186 17 2 38 19 93 45 Fail 81 Fail

2/11 Leila Place Simple gable 142 20 2 30 15 71 45 Fail 81 Pass

5 Tiaka Place Simple gable 145 18 2 34 17 72.5 45 Fail 81 Pass

56 Farrelly Place Mt Roskill Simple gable 117 18 2 27 13.5 58.5 45 Fail 81 Pass

6 Simmons Lane Mt Well Gable plus 2nd storey gable 142 26 av 20+30 5 34 28 40 Pass 67 Pass

5a Beatrix Street Avondale Hip and valley 97 30 3 30 32 40 Pass 67 Pass

5 Beatrix Street Avondale Hip and valley 85 30 1 26 85 40 Fail 67 Fail

105 Hillcrest Road Ptoe Hip and valley 167 17 4 (2) 64 84/42 45 Fail 81 Fail

4D Burnett Ave Gable 118 25 4 45 30 45 Pass 81 Pass

21 Kiwitea Street Sandringham 4 hip, 2 small valleys 136 28 3 51 45 40 Fail 67 Pass

35 Webber Street Westmere 4 hip 122 31 3 44 41 40 Fail 67 Pass

9 Dagenham Street Manurewa Hip and valley 145 25 3 49 48 45 Fail 81 Pass

5a Station Road Takanini Hip and valley 163 20 3 54 54 45 Fail 81 Pass

Building Code required Gutter

Capacity per downpipe

Sample Audit

Property

Sample

Properties

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European Gutters Value Proposition European Gutters promote and specify the following features, over those offered by conventional guttering, in support of a sustainable and cost-effective rainwater solution.

High capacity modular 150mm half round Gutter; The Lindab Gutter System uses high-capacity, half-round gutters coupled with the equally high capacity 87mm .60 gauge zinc coated steel downpipes that allow water to flow more freely. This helps to eliminate the build-up of debris that can cause regular gutters to become blocked and overflow.

Gutter Product; Capacity vs Stormcloud; Downpipe;

Marley Stormcloud (123mm) 5,100mm² 0% 80mm

Marley Typhoon (133mm) 6,100mm² +20% 80mm

Lindab (150mm) 8,900mm² +75% 87mm

Guttering designed for heavy rain; The Lindab gutter is also designed with a 6mm lower front than the back so that excess water flows over the front edge of the gutter and away from the house, rather than back towards the property. This unique system helps prevent damage to external cladding in the event of heavy rainfall or a gutter blockage.

The New Zealand Building Code requires water from guttering to flow away from the property. (E2/AS1 8.1.6(f)) The Lindab Gutters Overflow System ensures that water does not flow into the building in the event of a blockage or heavy rainfall.

Self-Cleaning Downpipe Diverters; European Gutters use the In\Out Debris Diverter on all downpipes which enter the stormwater system. Downpipe Diverters help to ensure that downpipes and drains stay free of blockages and stop debris from entering and polluting the storm water system.

The In\Out Debris Diverter also uses a customised sleeve to allow roofs and gutters to be cleaned without polluting the storm water system. This easy-to-use system allows work to be carried out quickly and efficiently, while complying with the Resource Management Act.

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External Brackets for better flow and easier cleaning; External brackets allow debris to flow more freely through the gutters and enable safe and easy cleaning to be carried out from ground level using a hose and wand system.

Cleaning gutters regularly is recommended in areas with mature trees and where plant growth is a problem. Cleaning properties from ground level is the only cost-effective maintenance option for the increasing number of multi-storey houses.

Robust zinc-coated steel Gutter & Bracket System; The Lindab gutter is made from.60 gauge zinc-coated steel, which provides it with added strength and minimises the damage caused by ladders. The robust bracket system also helps to make sure the gutter stays in place when overloaded by debris, heavy rainfall and blockages.

Easy installation and maintenance; Lindab Gutters use a modular clip lock system with EPDM seals and one-piece corners. No rivets or silicone are used during installation. This easy-to-use system allows for leak-free installation and the simple replacement and maintenance of the product once installed.

The steel is coated on both sides by a high-build polyester coating that has been UV tested to New Zealand standards and which provides exceptional durability. The only maintenance required is an occasional wash down.

Sustainability and the Environment; Lindab Gutter products are certified under the ISO 14001 Environmental Management system and are made from up to 30% recycled steel.

Steel has the lowest carbon footprint of any rainwater material and there are metal recycling companies throughout New Zealand which will accept metal gutters and downpipes in any condition. However, this won’t be any time soon, as Lindab report that the functional integrity of their system can last in excess of 70 years.

Roof Access Safety Considerations Extreme weather events, uncontrolled organic growth and windblown debris can lead to roof and gutter maintenance issues and cause leaks over time.

If kept clean most roofs and gutters are very robust and can maintain their street appeal and structural integrity for decades.

The Lindab Ladder Bracket is a colour coated product that can be permanently mounted on to the gutter at the safest access point.

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Temporary roof access to multi-level properties is particularly dangerous. The permanently fixed Lindab Ladder Bracket will prevent a ladder from sliding, when Operators are accessing the roof to undertake responsive or programmed maintenance work. In the following photos the Lindab Ladder Bracket has been modelled in white so that it contrasts with the black gutter.

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Lindab Colour Options Lindab offers a full range of colour options.

Eureopean Gutters is currently offering HNZ the Lindab 150mm Gutter in Antique White, Black and Dark Grey and the Lindab 190mm Gutter in Antique White.

European Gutters recommends the use of Antique White as a primary specification as it is a universally compatible, accessible and replaceable colour, which helps in reducing long term maintenance costs.

The listed colour matches are based on the European Gutters current range of Lindab colour swatches. This chart can be updated to reflect the specification requirements of key customers.

Advantages of wooden fascia; EGL actively promote the use of a wooden fascia with the Lindab Gutter System, as it has over twice the life of metal fascia. Wooden fascia also requires less maintenance and can easily be repaired and replaced by the metre. Whereas houses with metal fascia often require the replacement of the side of a building or the whole house as often you are unable to match profile, colour and clip systems.

Lindab Gutter and Metal Roof &

Fascia Colour Compatiability Review

New Roofing:

1/ Eureopean Gutters recommends the followng Lindab Gutter and metal Roof & Fascia colour

combinations.

ROOF COLOUR FASCIA COLOUR LINDAB MATCHING LINDAB COMPLIMENTRY

ANY COLOUR ANY COLOUR (OR

CLOUD TO MATCH

WHITE GUTTER)

ANTIQUE WHITE ANTIQUE WHITE

DESERT SAND DESERT SAND ANTIQUE WHITE

EBONY EBONY BLACK ANTIQUE WHITE

FLAXPOD FLAXPOD ANTIQUE WHITE

GREY FRIARS GREY FRIARS DARK GREY ANTIQUE WHITE

GULL GREY GULL GREY ANTIQUE WHITE

IRONSAND IRONSAND ANTIQUE WHITE

KARAKA KARAKA ANTIQUE WHITE

LICHEN LICHEN ANTIQUE WHITE

SANDSTONE GREY SANDSTONE GREY ANTIQUE WHITE

SCORIA SCORIA ANTIQUE WHITE

THUNDER GREY THUNDER GREY ANTIQUE WHITE

WINDSOR GREY WINDSOR GREY GRAPHITE GREY ANTIQUE WHITE

LIGHT OR DARK

COLOURS

LIGHT or DARK

COLOURS

COPPER METALIC

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European Gutters Supply and Install Options; European Gutters sells Lindab Gutters and In\Out Diverters to Builders, Roofers, Plumbers and Homeowners on a nationwide basis from warehouses and depots in Auckland, Hamilton, Hastings, Wellington and Christchurch.

European Gutters Existing Property Installations The Lindab 150mm modular rainwater system, comprising an externally bracketed, .60-guage zinc coated steel, half round gutter, with a 8,900mm² capacity, built in overflow system, 87mm round downpipes and In\Out Debris Diverter has been specified on a number of existing and new build properties, including the following sites.

Princess Street, Takanini Audit Commentary:

Lindab gutter installed in conjunction with a steep pitch concrete tile to longrun reroof. There is no exposed fascia with this installation.

Oratu Place, Manurewa Audit Commentary:

Lindab gutter installed in conjunction with a concrete tile to longrun reroof. There is no exposed fascia with this installation.

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Simmonds Lane, Mt Wellington Audit Commentary:

Lindab gutter installed in conjunction with a concrete tile to longrun reroof. There is no exposed fascia with this installation.

Leila Place, Clover Park Audit Commentary:

Lindab gutter installed in conjunction with a metal tile to longrun reroof. There is no exposed fascia with this installation.

Tiaka Place, Pakuranga Audit Commentary:

Lindab gutter installed in conjunction with a metal tile to longrun reroof. There is no exposed fascia with this installation.

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Great North Road, Waterview

Lake Road, Takapuna

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Bader Street, Mangere

Bernard Street, Mt Wellington

Raglan Street, Mangere

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Clayton Avenue, Otara

Bentley Road, Otara

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Building Code, Industry & RMA Support Documents

Building Code Requirements

E2/AS1, the NZMRM CoP, AS/NZS 3500, Lysaght’s and Dimond Roofing all state that Gutter

Systems must be designed so that water cannot flow back inside the building.

E2/AS1 pg60

E1/AS1 pg44

NZMRM COP 2012

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AS/NZS 3500 states that high fronted gutters must incorporate provisions, such as slots in the front of the gutter, to stop water flowing back into the roof or building structure. The Lysaght Rainwater Solutions brochure and the Dimond Roofing website also specify overflow requirements for high fronted gutters.

Dimond Roofing Overflow requirements

“There should always be an overflow

outlet provided as a secondary means to

allow water to discharge outside of the

building, should a blockage occur or in

heavy rainfall conditions beyond the scope

of the design. This must eliminate water

from the gutter entering the building”

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In New Zealand high fronted gutters have historically been designed to act as a screen, to

reduce salty air from being blown up inside the roof. However, this issue is generally limited

to ISO Category 4 & 5 environments and most new builds have

an eave flashing, which negates the need for a high fronted

gutter. Eave flashings can also be installed when replacing

existing gutters on an as required basis.

Though the New Zealand building industry accepts that the overflow from high fronted

gutters will flow over the back of the gutter and down the cladding, there is no Industry

specification as to the minimum gap required to allow this to happen, without the risk of

water tracking inside the building or the concentrated wetting of the cladding.

Resource Management Act Requirements The Resource Management Act states that it is illegal for any substance other than rainwater to be discharged into the stormwater system.

BRANZ 2016 Healthy Houses Report The BRANZ 2016 Healthy Houses report found that, “Ten of the fourteen

sample houses required gutter maintenance, ranging from simple

clearing and cleaning through to a full gutter replacement. Effective

guttering removes stormwater from the

dwelling and channels it away to maintain

dry conditions”.

Eave

Flashing

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Gutter Capacity Specifications

The Marley Stormcloud 123mm wide gutter is HNZ’s only procurement gutter. It uses an

internal bracket system, and has a cross sectional capacity of 5,100mm².

The Lindab 150mm wide gutter uses an external bracket system and has a cross sectional

capacity of 8,900mm².

Gutter Product; Capacity;

Marley Stormcloud (123mm wide) Current Procurement Product 5,100mm²

Marley Typhhoon (133mm) 6,100mm²

Continuous 150 Half Round (150mm) 8,700mm²

Lindab (150mm) 8,900mm²

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Stormcloud is

regularly used on

many older

properties.

In order to be

compliant with the

Building Code

Stormcloud requires

more downpipes

than larger capacity

gutters and it is not

widely used on

residential new

builds

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