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Sealants, Insulation and Barriers and How to Install Them
Published in Stan Harbuck, Donna Harbuck, Residential Energy Auditing and Improvement, 2021
Regardless of which technique is used to install foam board, be sure to seal any gaps in the foam board with one-part foam to seal out air and moisture. You should also use an adhesive to preliminarily attach the foam board to the foundation wall and to attach the drywall to the foam board. If you use metal furring strips, a special self-tapping metal screw is used rather than the typical drywall screw to attach the frame to the metal furring strips. The metal furring strips themselves can be attached to the wall with concrete screws or by “shooting” concrete nails through the metal furring strips into the foundation with a powder-activated nail gun. If you use the gun, be sure the foundation material is suitable for use with the nail gun because some block, for instance, will break when a nail gun is used.
Wall Systems
Published in Donald B. Corner, Jan C. Fillinger, Alison G. Kwok, Passive House Details, 2017
Donald B. Corner, Jan C. Fillinger, Alison G. Kwok
In summary, the logic that prevails for heating climates is to construct an inner structural leaf with sufficient framing density to support and connect the floors and roof, combined with an outer insulating leaf with as little framing density as possible, to reduce thermal bridge effects. The amount of framing material in the outer, insulating leaf of the wall depends on two things: the weight of the exterior finish materials and the way in which the window and door penetrations are developed. Lightweight exterior wall claddings may be attached to furring strips that hang from screws driven through layers of rigid insulation. Heavier claddings, or operable exterior shading systems, may require more a substantial connection to the load-bearing wall within.
Moisture robustness of eaves solutions for ventilated roofs: Experimental studies
Published in Science and Technology for the Built Environment, 2019
Steinar Grynning, Silje Kathrin Asphaug, Lars Gullbrekken, Berit Time
Figure 3 shows a schematic of the test sample, which was planned, built, and mounted in the surround-template of the test apparatus (the RAWI-box is described in the test procedure section). The area of the sample exposed to the WDR had an area of 2.45 m x 2.45 m. The load bearing structure was made using a 148 x 48 mm wooden framework. The width of the roof surface was 1.8 m. Transparent acrylic boards (made of Lexan) were used as wind-barrier in the wall and to represent both the underlying roof and roof cladding. The ventilation aperture in the roof had a total height of 72 mm, as shown in Figure 3. This was achieved using 36 x 36 mm counter battens running parallel to the load bearing construction. This separated the roof surface into three chambers divided by the battens. The 36 x 36 mm tile battens were orientated perpendicular to the load bearing construction representing the furring strips for mounting of the roof cladding. The rain screen of the wall was made of 19 mm thick wooden cladding. The front end of the roof cladding was covered with a 200 x 19 mm wooden board (weatherboard). A standard steel gutter was placed in front of this to promote realistic airflow vectors to ensure visual inspection of any rain hitting the layers of the roof and wall. Joints between boards and other movable parts were made air-tight using adhesive tape. A de-pressurization chamber was constructed in the rear of the ventilation aperture. This chamber was used to adjust wind-speeds in the ventilation aperture of the roof and to prevent any rain not deposited on the roof surfaces from exiting the aperture. The sample was subject to pressure differences as described in Table 1.