Large Scale Exterior Details - Integral Consulting · A6 Large Scale Exterior Details:: A6.1 A. Large Scale Details tagged to the West Elevation section on sheet A5.1; 1 ½” Scale:

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A6.1 A. Large Scale Details tagged to the West Elevation section on sheet A5.1; 1 ½” Scale: ____

1. These details appear to be at 1 ½” scale, not ½” scale as noted. ____

2. Detail #1 & #1A: ____

a. The corresponding structural detail is 18/S3.1. Currently it seems that none of the drawings dimension the foundation wall nor tie it to a structural gridline. The structural drawings reference the architectural.

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b. The architectural drawings show the insulation running past the foundation wall whereas the structural shows the foundation wall thicker in the insulation zone.

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c. The structural drawings show the precast plank with grouted end and doweled into the foundation wall, whereas the architectural drawing calls for compressible filler with sealant joint. I would assume the structural is correct.

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d. The detail has the plank direction incorrect. ____

e. Refer to the commentary associated with the structural detail regarding the fill and mud slab.

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f. It doe not seem necessary to have a vapor barrier at this condition. ____

g. The building elevation sheets state that “Typical exterior masonry wall construction to have R value of 25.45”. Has this been demonstrated? Three inches of extruded-Polystyrene board insulation may account for approximately R15 but there may be some loss due to the wall ties. Does the sum of the other construction account for more than an R value of 10?

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h. There is a vapor retarder material installed on the inside of the extruded-Polystyrene board insulation with a permeance rating of 0.137. Per the specification the insulation joints are to be sealed by applying adhesive, mastic or sealant. The note states to tape all joints. I’m thinking that the specification may be correct. I don’t think we want the insulation which is a closed cell product to also be acting as the vapor retarder.

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i. Detail #1A dimensions the face of brick as 2’ – 0 ½” from the structural gridline and an overall wall construction thickness of 1’ – 5 ¾”. The dimensioning on the floor plans is incomplete and this dimension can not be cross reverenced against the plans.

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j. The 1 ½” air space in the cavity seems to be the minimal dimension necessary. It will be important to keep the cavity clean; adding the mortar net by itself is not sufficient.

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3. Detail #2; Classroom Masonry Wall at the Floor: ____

a. The detail does not state which floor it applies to but per A5.1 it applies to the third floor and the detail at the second floor is similar. At the second floor there is a brick joint at the floor line rather than a center of brick at the floor line as shown here.

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b. There is no corresponding structural detail of this condition. The Schematic Design structural drawings should have included a corresponding detail because this is one of the most typical details on the project. The beam size, concrete plank and topping appear to coordinate with the structural drawings. This architectural detail shows the top flange of the beam aligned with the top of the precast planks. However, several of the structural details which do show steel beams and precast planks have the top of steel at the elevation of the bottom of the planks. Architecturally it is better as drawn (aligned with the top). There needs to be a corresponding structural detail and it needs to address the bearing of the planks.

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c. The lateral support for the CMU and the bond beams are similar to detail 11/S5.2. The bond beams are not graphically correct and are better represented on the structural drawings. Also, the anchor bolts should be tied into the grouted cell, not into the bottom web of the block. It’s also going to be a challenge installing these anchor bolts. It seems that they need to be installed from outside as the bond beam is installed. Not sure how one gets their hand around to access the bolt at the angle.

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d. There is furred out gypsum board on the inside. The depth of this is not dimensioned anywhere on the set that I could find. It scales between 1’ – 7” and 1’ – 8” from the outside face of the masonry depending on the drawing. There needs to be a large scale plan detail of this condition. Per plans on A8.1 and A8.2 at these window jambs the CMU is exposed and the gypsum board terminates into the CMU. If this is the desired condition then there should be a detail showing how the gypsum board meets the CMU; I would suspect that there would be some type of reveal or sealant joint detail at the interface. If exposed CMU is not desired one option would be just to laminate gypsum board to the CMU with a joint at the window. The quality of the laminated gypsum board might not be high due to the substrate. Furring out gypsum board on any return will reduce the width of the CMU and have multiple ramifications.

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4. Detail #3; Roof Parapet / Expansion Joint Detail: ____

a. There is no corresponding structural detail; see structural drawing comments. Detail 16/S4.1 is similar except there is no topping slab. From the structural plan the beam and plank appear consistent.

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b. This detail and other indicate a “Masonry Weep Vent @ 24” O.C.”. This appears to indicate a head joint louver for bricks assuming a head joint of 3 5/8”. I have used this detail before on a glazed brick project because the glazed brick does not breathe. Is this a necessary and/or desirable detail? When I used this it’s a stamped louver 3/8” wide by 3 5/8” tall with a folded flap at the top. How does this work when the vertical joints are nominally 16”?

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c. This detail calls for “2 layers of ¾” and one layer of ½” exterior grade plywood glued and nailed together” to be anchor bolted to the center of the CMU at a bond beam. This cantilevers 8” from face of CMU which is more than a foot from the anchor bolt. It is not attached to the face brick. Is this a dimensionally stable condition?

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d. The coping is approximately 1’ – 6” wide with down turn edges 4” outside and inside. It seems that this is a case for larger scale detailing to address the clips and the joints between pieces should also be addressed.

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e. It seems that there should be an engineered detail on the architectural or structural drawings of the cold-formed framed parapet wall. This is a cantilever of approximately 1’ – 6”. The framing and anchoring should be clearly detailed and noted.

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f. Per the Roof Plan sheet A1.4a ____

A6.3 B. Large Scale Wall Section Details East Elevation tagged to Wall Sections on Sheet A5.4: See marked up detail 5 for example of simplifying the detailing.

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A6.4 C. Large Scale Wall Section Details tagged to Wall Sections on Sheets A5.6: ____

1. Detail #7; Curtainwall Sill Detail at Main Entry: Detail 17/S4.2 is the associated structural detail. ____

2. Detail #8; Main Level slab along gridline G between the gym and the plaza: ____

a. Per C6.1, the Civil grading plan, the plaza elevation at the low points at the drains is +20.10 and the elevation along gridline G is elevation +20.50 which equates to elevation +6’ – 0”. If the top of plank is set 4” below +20.10 then the elevation of the planks would be approximately +19’ – 9 ¼”.

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b. Per the hardscape paving plan on L5.2 the paving pattern consists of what appears to be 3 different paver sizes, all rectangular. In the specification there are several different pavers none of which seem to be a specific unit matching up with the plan. There are pavers specified in Division 2 and there are pavers specified in the Hot Fluid-Applied Rubberized Asphalt Waterproofing section, Specification section 07142. If we use this specification section for construction reference of the plaza, the pavers are 2 ½” thick and set on pedestals telescoping between 2” to 5 ½”. I would think that this is the correct specification section however the pavers are typically 2” thick and the support system should be tabs which are just a fraction of an inch thick.

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c. Refer to the attached paver detail UA-1 of a Typical Termination at Wall / Parapet / Curb detail of the American Hydrotech system for a recommended detail assembly.

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d. The architectural and structural drawings need to coordinate the concrete curb detail. ____

e. Per the structural drawings the beam is a W24x68 with a 12” precast concrete plank. The steel beam framed to the end of the precast plan is not within the structural detailing. This seems unnecessary; it seems that the precast plank could project into the cavity and clips to the precast plank could provide the lateral bracing for the masonry.

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f. I would recommend extending the concrete curb beneath the window system. It would be simpler than the concrete curb and block detail. Also, it would be less expensive and provide better support for the window. A CMU curb may be unstable.

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g. The detail is suggesting a steel plate sill; this detail needs to be developed.

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3. Detail #6; Main Level Slab at 5/A5.7: This detail should be redesigned so that the foundation wall is at the door, not at the principal building face. Shifting the foundation wall could eliminate the CMU wall as well as the recessed slab with waterproofing.

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a.

b. A simpler detail would be to anchor a 10” channel or 10 wide flange directly to the bottom

of the plank and infill with CMU. Then there is a simple joint between the steel and the door frame.

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c. The louver extends to just above the door frame; no elevation is provided. If it is it the intent to blank-off the back of the louver, this needs to be clarified.

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d. This soffit is detailed as a captured air space with thermal insulation at the line of the soffit and it is unheated or otherwise conditioned. I would recommend moving the insulation to the underside of the plank and ventilating the soffit with small reveal details such as Fry Reglets.

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4. Detail #8; Head condition at the louver at 5/A5.7: This detail should be coordinated with the structural engineer. The primary lintel is in line with the CMU. This lintel should be accompanied with a steel plate and shelf angle to pick up the brick; there should not be a large steel channel.

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A6.7 D. Exterior Details; details tagged to wall sections on sheet A5.11: ____

1. Details #2 and #3 look like they require work and could be much simpler; however, we did not review.

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2. Revise detail #5 to coordinate with structural detail 11/S4.2. ____

3. Detail 8 shows an incorrectly sized perimeter beam: Per S1.3a Partial Second Floor Framing Plan Area A, the perimeter beam is W12x22.

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A6.9 E. Details at Parapet / Mechanical Penthouse; 1 ½” Scale: Not reviewed. ____

A6.10 F. Roofing Details: ____

1. Detail #2; Roof Drains: This detail generally seems fine and seems consistent with the scheduled roof drains. What I’m not quite clear about is how the clamping and flashing work at the deck.

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M7 Series A. Mechanical Schedules. ____

1. Devices shown on M1.1a in the Dining Room ceiling do not appear to be scheduled. ____

P1.1a, P1.2a, and A1.2a

B. Plumbing Main Level Plan Area A; 1/8” Scale, Plumbing Level 2 Plan Area A; 1/8” Scale, and (Architectural) Second Level Floor Plan Area A; 1/8” Scale:

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1. Reference Sketches attached showing steel girder and beam roof structure, and both existing and proposed roof drain layout and horizontal roof storm drain layout.

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