Wind mitigations Photos and roof decks
The Uniform Mitigation Verification Inspection Form(UMVIF or 1802 form) requires that photographs be included as proof when submitting the form it is stated on the form itself:
NOTE: At least one photo documenting the existence of each visible and accessible construction or mitigation attribute marked in Sections 3 through 9 must accompany this form.
These photos include the roof deck attachment, roof to wall attachment, roof geometry, gable end bracing, wall construction type, secondary water resistance of the roof and opening protection. Some of these items take several pictures to fully document.
Roof Deck Attachment: They want to document what the weakest form of roof deck attachment from the choices below:
A. Plywood/Oriented strand board (OSB) roof sheathing attached to the roof truss/rafter (spaced a maximum of 24” o.c.) by staples or 6d nails spaced at 6” along the edge and 12” in the field. -OR- Batten decking supporting wood shakes or wood shingles.-OR- Any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent mean uplift resistance of 55 psf.
B. Plywood/OSB roof sheathing with a minimum thickness of 7/16” attached to the roof truss/rafter (spaced a maximum of 24” o.c.) by 8d common nails spaced 6” along the edge and 12” in the field.-OR- Any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent mean uplift resistance of 103 psf.
C. Plywood/OSB roof sheathing with a minimum thickness of 7/16” attached to the roof truss/rafter (spaced a maximum of 24” o.c.) by 8d common nails spaced 6” along the edge and 6” in the field. -OR- Dimensional lumber/Tongue & Groove decking with a minimum of 2 nails per board. -OR- Any system of screws, nails, adhesives, other deck fastening system or truss/rafter spacing that has an equivalent mean uplift resistance of 182 psf.
D. Reinforced Concrete Roof Deck.
E. Other: __________________________________
F. Unknown or unidentified.
G. No attic access.
The way to verify these items is visually, measure and using a metal detector to measure nail spacing in trusses or rafters.
