Roof Deck Inspection

Also the roof will be evaluated from the attic and check the components such as the structure of the trusses rafters sheathing ventilation insulation and roof penetrations.

Roof deck inspection. The image above depicts a high deck being supported with 4 x 4 posts. Tall 4 x 4 posts twist under load and 4 x 4 posts even when treated decay below grade too quickly. Existing roof decks compliance schedule 3 1 existing roof decks which have been previously permitted through the inspectional services department must comply with the. Although deck inspections are visual only inspections inspectors may want to dig down around posts and perform pick tests just below grade level to look for decay.

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. The maximum span for roof sheathing is limited by the stresses and deflections caused by the design loads. To qualify for wind mitigation credits it s essential to have a roof that has the proper amount of nails with the proper length and design to withstand the most wind. These problems could show up in the form of water damage dry rot de lamination if plywood cupping if ship lap or 1 inch boards and general damage.

During the deck inspection every square foot of the plywood needs checked for problems. After the inspection you should receive a comprehensive written report with photos of any outstanding issues. This inspection is conducted to evaluate roof shingles roof penetration flashing eaves and rake gutter and downspout systems. In the first half of the 20th century roofs in missouri were built with wood shingles over planks spaced about 1 apart.

Roofing over any of these problems is asking for trouble later on in your home s life. The inspection agencies include a span rating label on the panels which indicates the maximum spans for that panel. Roofs not accessible to tenants or alarmed in accordance with cbc 9 9 13 3. This measures on a scale of 1 weakest to 3 strongest how well your roof is attached to the rafters of the frame on your home.

Pre inspection bothell and kenmore prior to the installation of an additional layer of roofing material over an existing layer s. The rating appears as two numbers. The labels above are common apa rating labels for roof sheathing. Securement note whether all steel deck panels are securely welded or mechanically fastened to the structural supports.

Wood shingle are expensive so when these roofs need to be torn off and replaced it is cheaper to resheath the entire roof and go over it. Nailing or progress inspection. What needs to be checked during a roof deck inspection. After the removal of all existing roofing material and underlayment prior to recovering prior to installing roof coverings on all roofs having a slope of 2 12 or less.