DESIGN & ACCESS STATEMENT INCOPORATING HERITAGE …€¦ · Both doors are double glazed however the side light beside D 3 is single glazed and suffers from the same problem as the

1519DAS-1

DESIGN & ACCESS STATEMENT INCOPORATING HERITAGE STATEMENT AND PLANNING STATEMENTS

Submitted in support of a Listed Building application for replacement windows and door and renewal of injected damp proof course

at:

Barn Owl Cottage, 21 Little Oakley

prepared for:

Dr & Mrs R N Whittaker

Architects

McDonald Architects Keepers Lodge, Brigstock

KETTERING NN14 3NA

Document No 1519DS

Revision

A Prepared by DGK

Checked by

DGK

Date 30 April 2015

Date: 13 May 2015

1519DAS-1

BACKGROUND

The site subject of this proposal is a Listed Building Grade II comprising a house and attached thatched barn which has been converted into residential use. The listing is for both No20 and No21 Little Oakley and the attached barn. The listing specifically notes that the interior has not been inspected. Listing reference SP8885 1337-0/11/187.

Some years ago the property was extensively altered with comprehensive modernisation of the interior. Some historic features such as beams, rafters, etc. remain but detailed historic features such as joinery, wall and floor finishes, fittings, cooking ranges, etc. have all been removed (planning ref: KE/88/1363).

In 2011 an extension as added to the southern end of the barn part and a free-standing oak framed and clad garage was built at the southern end of the site (planning ref: KET/2010/0110 & 0111

The property lies within the Little Oakley Conservation Area.

THE PROPOSAL

It is proposed to replace and refurbish the windows and doors of the property. Most of the windows and all of the doors date from 1989 at the earliest. The units installed at that time were of poor quality and would have had a design life of 25 years at the most. Some are double glazed, some single with no obvious reason for the difference in glazing other than incompetence. This opinion is supported by the fact that single glazing has been installed into frames that have rebates for double glazing and with double glazing beads that are far too shallow to be effective when used with single glazing. This has led to water penetration around the glazing with consequential rot of both the glazing beads and the glazing bars. Furthermore, the cills have no drips or any sub-cill and this had led to the deterioration of most of the bottoms of the frames. Regardless of the design and installation shortcomings, all of these units have reached the end of their design life and need to be replaced. There are a few older windows in the property that are also in need of replacement. These are 3 composite metal casement/timber sub-frame units (W15, W17 & W21) and one timber casement (W 18). The metal casement units are in a particularly poor state having distorted over time and being now so misshapen that they cannot be shut as the photographs below clearly show.

W 17 internal view- closed W 21 internal view- closed

1519DAS-1

In the case of the composite metal/timber windows, it is proposed to replace them with steel casements set into new hardwood sub-frames with new tiled cills where these are missing. Details of the proposed replacement steel windows are attached as Appendix A. The doors all date from 1989 or later. Doors labelled D 3 and D 4 on the application drawings are part of glazed screens. Both doors are double glazed however the side light beside D 3 is single glazed and suffers from the same problem as the single glazed windows described above – single glazing installed into a frame designed for double glazing. It is proposed to reglaze the side light to D3 with double glazed units to match those used next to D4. Any rotten glazing bars found will be cut out and replaced to match the existing. Door D5 was installed in 2011 and provides a pattern for the proposed replacement of D 6 which dates from 1989 and has also reached the end of its design life being both partially rotten and warped. It is also proposed to renew the injected damp proof course that was installed in 1989 under the guarantee from Rentokill. The area concerned is the western flank wall that forms part of the covered entrance passageway. The wall has been rendered and this work should have no discernible impact on the appearance of the building. The Rentokill report is attached as Appendix B. A modest amount of plaster will be renewed where the injection process is applied.

HERITAGE STATEMENT

The majority of the windows and all of the doors that are subject to this application are modern. Not only are they modern, they have not been designed to be sympathetic to the historic fabric of the building and can have no heritage value. Their replacements will have slimmer glazing bars and flush casements rather than modern ‘storm casements’ and thus will have a more fitting appearance. The composite steel and timber windows are a different story. However, the steel parts are so badly distorted that they are beyond economic repair. The replacements proposed are made by a manufacturer that specialises in replacement of steel windows in historic buildings. Whilst the replacements will not be identical, they are a very good match and are considered appropriate for this building. It has been suggested that the thermal performance of the historic windows can be improved by the addition of secondary double glazing. This has already been tried without success as the casements cannot be shut due to being badly misshapen and thus the full force of wind and rain reaches the secondary glazing which of course is not designed to withstand such an onslaught. Not only are the draughts intolerable, but the window cills and reveals are being damaged by the ingress of rainwater. Considering that the steel casements have to be replaced and that most of the other glazing is already double glazed, it seems sensible to use new slim line steel units with narrow section double glazed units. The repair of the injected damp proof course probably does not require Listed Building consent, being a like for like repair. We therefore maintain that the impact of these proposals on the Listed Building will be minimal.

CONSERVATION AREA

As the proposals are replacements to closely match the existing in the case of the steel composite windows, or improvements on the appearance in case of the 20th Century timber windows and repairs, the proposals do not affect the Conservation Area.

1519DAS-1

PLANNING STATEMENT

The following are relevant policies: National Planning Policy Framework Policy 12 – Conserving and Enhancing the Historic Environment North Northamptonshire Core Spatial Strategy Policy 13 – General Sustainable Development Principles Legislation Planning (Listed Buildings and Conservation Areas) Act 1990

In the Heritage Statement above we have addressed NPPF Policy 12 and by seeking to improve the air-tightness and thermal performance of the windows and doors the proposals accord with NNCSS Policy 13.

1519DAS-1

APPENDIX A – CLEMENT WINDOWS

superb steel windows for private residences

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Welcome to the new Clement Windows residential brochure.

Presented here is a selection of private homes where we have recently installedsuperb steel windows from the Clement EB ranges.

Clement design, manufacture and install superb steel windows which are made-to-measure for your home. We can help you select the features that you seekin your replacement windows from our extensive range of solutions.

The owners of the homes illustrated all selected windows from the Clement EBwindow ranges. The many options for glazing style, frame colour and window fittingsmean that we will carefully make your replacement windows using your specificdesign choices. The result: beautiful and high-performance steel windows thatcomplement your home.

For 100 years and without interruption the Clement family have been lovinglymanufacturing steel windows, it is our passion. Past clients include manyrecognisable names and Clement steel windows have been fitted into numerous highprofile landmark buildings, not surprisingly it was Clement steel windows that werespecified for the recent restoration of The Savoy Hotel. Clement’s reputation forexcellence and innovation is well known in the industry, and of this we are very proud.

We look forward to providing you, our client, with the best steel windows and the finest service.

An early piece of equipment used by Clements, this

hand operated mitre saw was made by Goodell Pratt,

Greenfield, Mass. USA and is dated June 20th 1899.

3


8


11


New residence, Buckinghamshire

EB24 used as inserts into timber frames

Frame colour: RAL 9005 Deep Black

Glass: Leaded light 24mm double glass panels with soldered joints with 12mm flat lead

18


20

The EB24 rangeElegant, energy efficient, easy to maintain andhighly secure: these are the outstanding featuresunique to EB24, the top performing window in theEB range. No other residential window can offerfeatures that are comparable.

- Slimmest steel frame to give maximum glazedarea and solar gain

- High performance 24mm sealed double-glazedglass units

- Glass can be clear, leaded lights or Georgian bars

- Option of highly secure multi-point locking tested to BS7950

- Hot dip galvanised protection

- Comprehensive range of long-lasting durableframe colours

- Energy Window BFRC ‘B’ or ‘C’ rating, andcompliant with Part L of 2010 Building Regulations

- Well designed window and door furniture

- Bespoke manufacture in our own ISO 9001registered factory

Clement EB product ranges

Handmade to your specific requirements,EB steel windows and doors are the mosttechnically advanced replacement productsfor your original Crittall windows.

The EB14 rangeEB14 steel windows share many of theoutstanding qualities of EB24, but somespecific projects in Conservation areas or forlisted or historic buildings require differentdesign solutions and a more subtle doubleglazed detail is preferred. EB14 provides thesolution.

- Slim steel frame that offers closest match tooriginal windows

- Choose between single glazing or 14mm sealed double-glazed glass units

- Choice of glass – clear, leaded lights orGeorgian bars

- Wide range of long-lasting durable framecolours

- Good selection of window and door furniture

SMW windowsSpecified for historic or listed buildings,Clement’s EB SMW windows are purposemade using steel sections and windowfurniture that replicate the original earlywindow designs. Indeed it is possible onvery sensitive single glazed historicreplacement projects to achieve a precisegeometric match.

SMW windows are not described in detail inthis brochure – please contact us if you wouldlike more details of these specialist windows.


Clement's 100 Year Heritage

The Clement Service

Clement Window Ranges

SMW Range

» SMW Technical Specifications

Testimonials

Residential Photo Gallery

The SMW (Standard Metal Window) "F" series

window range has been manufactured since the

1920's. SMW is only available single glazed, primarily

used now for sensitive replacement work in

Conservation Areas and Listed Buildings where

double glazing is not an option.

The SMW range consists of:

Fixed light, top hung, bottom hung, side hung, single

and double doors.

Features include:

Silicone fronted to replicate traditional face putty,

single glazed.

Specification

The windows are manufactured generally in

compliance with BS 6510. All frames and ancillary

profiles arehot dip galvanized to EN ISO BS:1461 and

available with afactory applied polyester colour

coating to EN ISO 13458 BS:6497.

Description

A bespoke steel window. Frames are manufactured

with corner joints mitred, welded and dressed square

and flat. Small panes can be formed with tee glazing

bars whose ends are tenon-riveted and/or welded to

the frame and whose cross joints are interlocked and

welded with rigid joints. Profiles are hot rolled from

mild steel and cold straightened. Composite windows

can be assembled by connecting windows

horizontally and/or vertically with mullions and/or

transoms of hot rolled slim steel profiles, box sections,

tubes, or box mullions manufactured from sheet steel.

Pressed metal cills are available in a choice of profile.

Glazing

Windows shall be prepared for glazing on site from

outside with single glass, using factory finished

beads, bedding and capping sealants in accordance

with BS 8000-7. Option for single glazing: glazing

from outside with spring clips (supplied by glazier)

and metal casement putty fronting.

Weatherseals

Ventilators will be fully weatherstripped with black

coloured dual contact ethylene propylene complying

with BS.4255:part 1:1986, secured into extruded

aluminium channels which are securely fixed to

opening frames and are concealed when the window

is shut.

Dimensions (mm)

Nominal profile width - 25mm

Typical sight lines: fixed lights perimeter < 40mm

Hinged casements < 50mm

Windows and doors for composite panels are purpose made,

generally within the limits shown in the table below; sizes

outside these limits may be considered with consultation.

Width Height Perimeter

WINDOWS Min

(mm)Max (mm)

Min (mm)

Max (mm)

Max(mm)

Fixed light 300 2000 300 2000 6800Top hung 300 1250 300 1300 4600Side hung 300 650 300 1350 3700Bottom hung 300 650 300 650 1300DOORSSingle 475 900 2000 2100 6000Double 950 1250 2000 2100 6600

Appearance

SMW windows provide the traditional qualities of slender sight

lines of framing and glazing beads, which maximizes solar

gain thereby saving energy through reduced use of artificial

lighting. Polyester powder coating is available in a range of

standard RAL colours.

Performance

Wind resistance, watertightness, air permeability

All SMW windows meet the weathertightness - air infiltration,

water penetration and wind loading - performance criteria

generally as in BS 6375: Part 1 appropriate to the

specified design wind pressure.

BS 6375-1:1989

Air permeability was measured in terms of opening joint length

(m³/h/m) against progressively increasing test pressures

through 200Pa (class A), 300Pa (class B) up to 600Pa (class

C). Class B, or a maximum value at 300Pa of about 16

m³/h/m, was the UK standard requirement. Watertightness

was measured in resistance to leakage at progressively

increasing test pressures, 300Pa being considered the most

severe UK requirement. Wind load resistance entailed

deflection and gusting

tests at pressures ranging from 1200Pa to 2400Pa.

Window Type BS 6375 –1 Test Pressure

Class 1989 EditionExposure Category

Wind Water Air

Fixed light 2400 300 600 2400 Top hung 2000 300 600 2000 Side hung (open out)

2000 200 300 2000

Side hung (open in)

1600 100 200 1200

Bottom hung 1600 100 200 1200

SMW Technical Specification

HOME RESIDENTIAL CLIENTS BUILDING PROFESSIONALS DOWNLOADS CONTACT US

Page 1 of 2SMW replacement steel window sections for heritage projects

05/10/2012http://www.clementwindows.co.uk/smw-technical.html

Clement's 100 Year Heritage

The Clement Service

Clement Window Ranges

EB14 Range

» EB14 Technical Specifications

Testimonials

Residential Photo Gallery

Introduction

Slimline beaded framing system providing a

conventional appearance for all configurations of

traditional metal windows, frequently specified for

Conservation areas, Listed buildings and dwellings of

historic interest. EB14 windows have been designed

specifically for use in sensitive fenestration projects

where a traditional steel window appearance is

required with the added advantage of being externally

beaded and having a 16mm unit. Horizontal and

vertical glazing bar design options are available.

Projects may be new build or refurbishment where the

original fenestration is to be maintained and windows

may be manufactured to fit existing apertures. Steel

windows may be fixed direct to brickwork, concrete,

stone or into subframes.

Features include:

Horizontal and vertical glazing bars polyester powder

coating weatherstripping ideal for 'like for like'

replacement accommodates insulating glass units of

14 mm thickness and chamfered clip-in bead locking

system.

The EB14 range consists of:

Fixed light, top hung, bottom hung, side hung, single

and double doors

Specification

The windows are manufactured generally in

accordance with BS 6510:1984 Specification for F

series steel windows. All frames and ancillary profiles

are positively rust-proof by hot dip galvanising to EN

ISO BS:1461 and available with a factory applied

polyester colour coating to EN ISO BS:6497.

Description

Composition, manufacture Frames are manufactured

with corner joints mitred, welded and dressed square

flat. Small panes can be formed with tee glazing bars

whose ends are tenon-riveted and/or welded to the

frame and whose cross joints are interlocked and

welded with rigid joints. Profiles are hot rolled from

mild steel and cold straightened.

Composite windows can be assembled by connecting

windows horizontally and/or vertically with mullions

and/or transoms of hot rolled slim steel profiles, box

sections, tubes, or box mullions manufactured from

sheet steel. Pressed metal cills are available in a

choice of profile.

Glazing

Windows may be single glazed using maximum 6 mm

glass or double glazed with sealed units of 14 mm

thickness. Glazing is on site, from outside, with

bedding and capping sealants in accordance with

manufacturer's preferred glazing system. Beads are,

generally, of aluminium extrusion which locate into

factory fitted carriers.

Weatherseals

Ventilators are weathersealed with neoprene weather strips

retained and secured on plastic studs within the profile. Under

no circumstance should weatherstripping be painted.

Dimensions (mm)

Nominal profile width 25

Typical sight lines: fixed lights perimeter < 40

Hinged casements < 55

Windows and doors for composite panels are purpose made,

generally within the limits shown in the table below; sizes

outside these limits may be considered with consultation.

Width Height PerimeterWINDOWS Min Max Min Max MaxFixed light 300 1800 300 1800 7200Top hung 300 1800 300 1300 4800Side hung 300 600 300 1300 3800Bottom hung 300 1200 300 1200 4800DOORSSingle 600 900 2000 2100 6000Double 900 1200 2000 2100 6600

Appearance

EB14 windows provide the traditional qualities of slender sight

lines of framing and glazing beads, which maximizes solar

gain thereby saving energy through reduced use

of artificial lighting. Its proprietary clip-in chamfered bead

closely resembles traditional outside putty glazing. Polyester

powder coating is available to any BS or RAL reference

colours.

Performance

H ea t

EB14 steel windows with insulating glass units and an air

space of 6mm, have typical 'U' values of 3.7 W/m2k with

ordinary clear float. 'U' values can be reduced with the

introduction of insulating glass units constructed of 1 x 4mm

float, 1 x 4mm 'Val U' and 6mm xenon gas filled cavity. Using

this glazing specification it is possible to achieve a centre

pane measurement 'U' value of 1.1 W/m2k.

Sound

Average sound reduction index (SRI) of a single glazed unit is

approximately 30 dB, but varies with window type and size.

EB14 Technical Specifications

HOME RESIDENTIAL CLIENTS BUILDING PROFESSIONALS DOWNLOADS CONTACT US

Page 1 of 2EB14 technical specifications for heritage window projects

17/12/2011http://www.clementwindows.co.uk/eb14-technical.html

Offices open 9-5 monday to friday

Showroom open 9-5 monday to friday, saturdays 9-12 or any other time by appointment

Clement Windows Limited, Clement House, Haslemere, Surrey, GU27 1HR .

Tel: 01428 643393 Fax: 01428 644436

[email protected]

superb steel windows

CW

L006

mm


1519DAS-1

APPENDIX B – RENTOKILL REPORT

Documents

DESIGN & ACCESS STATEMENT INCOPORATING HERITAGE …€¦ · Both doors are double glazed however the side light beside D 3 is single glazed and suffers from the same problem as the