Roof Installation Interply Void Tolerance

Remove debris contaminants aggregate or loose surfacing from the surface of the membrane or flashing to be repaired.

Roof installation interply void tolerance.

The pressure developed in the void stretches. When reroofing remove all prior roofing materials down to a clean debris free substrate and properly close off all abandoned roof penetrations. Installation but they grow with time. Moisture trapped in the void expand.

Roofing membranes for low slope application. Additional membrane s sheet to complete the roofing system. New york city hall used copper for roofing circa 1764 a copper roof was used on the rebuilt old senate chamber in 1819. Apply over clean dry dust and debris free substrates.

Roof traffic in an effort to avoid the inherent danger associated with walking on a roof we recommend that only licensed and insured professional contractors traverse roofs. Caution should be exercised to ensure personal safety and prevent damage to roof tiles that may void the warranty. Figure 2 poor interply bonding due to low application temperature a cap sheet b base sheet. Prime concrete decks prior to application with pg 100 asphalt primer.

Varied building systems have been developed to support vegetative covers on steeply pitched roofs. Pitched roof systems sometimes merge into vertical facade vegetative techniques. The area to be repaired should extend a minimum of 18 inches beyond the perimeter of the defect to provide an ample clean area on which to install the patch and tie it into the existing roof membrane. During installation of hot bituminous systems care warns that improper mopping can produce voids in the membrane block drains and result in ponding water as well as void the warranty.

To install extensive vegetative roof covers on pitches steeper than 2 5 12 12 degrees supplemental measures will be required to prevent sliding instability. Ensure all products are appropriate for the installation environment and array under the site s loading conditions. Pierce cautions that before roof repairs are hastily made the source of the ponding water should be investigated. Replaced in a 1900 renovation the slate roof on the white house was replaced with sheet iron in 1804 the copper roof on the old church of christ in philly lasted from the 1830s to 1967.

Section 3 truss installation 3 1 general 3 2 set out 3 3 lifting 3 4 first truss 3 5 subsequent trusses 3 6 erection bracing and tolerances section 4 roof bracing 4 1 general 4 2 battens 4 3 top chords 4 4 bottom chords 4 5 webs 4 6 top hat construction section 5 truss connections 5 1 hip ends 5 2 girder 5 3 gable end trusses.