Originally Posted By: rsmith5 This post was automatically imported from our archived forum.
At an inspection yesterday and the deck ledger board was nailed in place, with 2x8 joists in 2x4 joist hangers nailed on with roofing nails. I wrote up that the hangers were wrong and that half inch bolts 2’ on center should be installed in the ledger board. The joists were ten feet long.
Originally Posted By: gbeaumont This post was automatically imported from our archived forum.
Hi Ralph,
sounds good to me, I would have written up the improper hanger connections and also the lack of lag bolts (1 per bay minimum) also I hope to checked for ledger flashing and proper footings for the supports.
It's around a 20 by 20 deck with 2x6 joists, rim joists, and the central "beam". Three 4x4 posts supporting that "beam", no connections, all leaning and about to slip off the blocks. I wrote the whole thing up as inadequate construction methods, a safety hazard, and recommended they completely rebuild it. I just don't understand why someone would spend the money on materials but not the $10 on a simple "how to" book.
-- Richard Moore
Rest Assured Inspection Services
Seattle, WA
www.rainspect.com
Originally Posted By: rsmith5 This post was automatically imported from our archived forum.
Thanks Gerry,
What was really interesting was the header at the front was constructed of 4- 2x12 PT with 1/2" PT plywood, set on 4x4 posts with two 2x4s attached to make them the full width of the header and set at 8’ on center. Oh yeah, they were footed on the concrete patio beneath.
Originally Posted By: ccoombs This post was automatically imported from our archived forum.
You can use smaller hangers than the joist. It would depend on the allowable load for the hanger. However, there is no way the roof nails are structurally acceptable.
Originally Posted By: Michael D Thomas This post was automatically imported from our archived forum.
Disclaimer: I’m not a structural engineer, and I don’t even play one on ther internet.
That said:
My understanidng is that when installing ?per manufacture? you have some choice in hangers, but you can?t use any size you wish; for example you can?t use a 2x4? hanger with at 2x12?, and that the minimum size for a given application is specified in a table provided by each manufacturer.
For example here's the table for Simpson hangers in spruce-pine-fir:
?While galvanized steel provides some protection, testing has shown that it is still likely to corrode if in contact with treated wood. The service life of galvanized parts depends on many variables including the location, installation, exposure, and the thickness of the galvanized coating.?
To make this clearer, here?s set of salt spray test photos for various fasteners: