Roof Deck Inspection

Roofing over any of these problems is asking for trouble later on in your home s life.

Roof deck inspection.

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. The maximum span for roof sheathing is limited by the stresses and deflections caused by the design loads. The rating appears as two numbers. 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. 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. Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. 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.

A professional deck inspection cost typically ranges from as low as 25 for a 30 minute inspection to as high as 199 for a one hour inspection including a structural check safety check and common building code violations check. After the inspection you should receive a comprehensive written report with photos of any outstanding issues. 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. Pre inspection bothell and kenmore prior to the installation of an additional layer of roofing material over an existing layer s.

During the deck inspection every square foot of the plywood needs checked for problems. The image above depicts a high deck being supported with 4 x 4 posts. Roof decks accessed through a single access point within owner occupied units. 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.

Nailing or progress inspection. The inspection agencies include a span rating label on the panels which indicates the maximum spans for that panel. In the first half of the 20th century roofs in missouri were built with wood shingles over planks spaced about 1 apart. Roofs not accessible to tenants or alarmed in accordance with cbc 9 9 13 3.

Securement note whether all steel deck panels are securely welded or mechanically fastened to the structural supports. The labels above are common apa rating labels for roof sheathing. 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. In addition to the six steps in the inspection procedure applicable to all types of decks there are four more steps in the procedure for inspecting steel decks as follows.