Toe-Nailed Rafters With Partial Retrofit Straps
A 1962 concrete-block ranch has a low-slope hip roof. In the attic, most rafters are toe-nailed to the top plate; no metal connectors are visible on those. A prior owner retrofitted galvanized single-wrap straps on eight of fourteen accessible rafters. On three straps, one side is nailed with four 8d nails, the other side has two nails; two straps are loose and one is fastened only to drywall furring, not the block. The roof-to-wall connection is hidden at the far side by a flat ceiling and ductwork. There are no permits, engineer letters, or photos from the retrofit. The homeowner says the whole roof was strapped in 2010 and wants the best roof-to-wall rating.
1. Can the home receive a single-wrap credit? Explain.
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No. A single-wrap credit cannot be supported while visible rafters remain toe-nailed. Roof-to-wall attachment is a load-path rating, so the weakest connection controls. Eight straps out of fourteen visible rafters means at least six visible rafters lack a strap. The inspector cannot average the connections or assume the hidden side matches the retrofitted side. The straps that are loose or fastened to furring do not count because furring is not the structural top plate or bond beam; the strap must transfer uplift from the rafter to the wall with approved fasteners. The homeowner statement is not enough to override visible toe nails.
2. How should the defective straps affect the report?
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Treat each defective strap as a failed or unverified connection. A strap with two nails on one side may not meet the product fastener schedule; a loose strap may not engage the rafter; furring attachment provides no reliable load path. Photograph each defect with location and a tape measure. Report the roof-to-wall connection as toe nail unless the defective straps are repaired and re-inspected. Do not describe the roof as fully strapped in the narrative, because that would be contradicted by the visible toe-nailed rafters.
3. What follow-up evidence would allow an upgrade?
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Obtain the retrofit permit and final inspection, manufacturer installation instructions, and an engineer letter if the connection is unusual. Expose a representative connection at the hidden side or use a borescope. Photos should show strap type, number and type of fasteners, embedment or approved anchor into block, and tight fit to the rafter. If these cannot be obtained, report toe nail and explain the limitation. An affidavit alone is weak when visible connections contradict it.