Question about roof deck attachment.
Roof deck attachment levels.
There are four levels of discounts from a weakest attachment lowest discount to c strongest attachment best discount.
If roof deck.
Plywood osb with 2 1 2 inch nails spaced at 6 inches from the edge of the plywood and 12 inches in the field on 24 inch truss spacing.
Attachment c reinforced concrete roof deck a.
A roof structure composed of cast in place or pre cast structural concrete designed to be self supporting and integrally attached to wall support system.
Ponding can be an indication of structural distress and may require the review of a professional structural engineer.
Levels b or c.
Beginning in october 1 2007 roofing contractors have been required to re nail the roof sheathing using 8d 8 penny ringshank nails at 6 inches on center.
The current roof system and or deck of the building may not drain well and may cause water to pond accumulate in low lying areas of the roof.
Plywood oriented strand board osb with 2 inch nails spaced at 6 inches from the edge of the plywood and 12 inches in the field on 24 inch truss spacing.
Metal roof deck made of structural panels that span from joist to joist.
Attachment b metal deck a.
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.
All homes built 2002 to.
I would like to be able to check box b for the client but i think 6d spaced 6 6 is weaker than 8d spaced 6 12 craig howard cmh home inspections.
Ponding may shorten the life expectancy and performance of the new roofing system.
Roof deck attachment for the south carolina safe home program when a home is being upgraded as part of the program and the roof covering is removed and replaced the following procedure shall be performed if needed according to the nailing patterns detailed in table b 1.