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How to qualify this nailed plate

How to qualify this nailed plate

How to qualify this nailed plate

(OP)
I am working on a remodel for a client and I am having to qualify the existing trusses for additional loading. The house was built maybe 20 years ago and the lumber used for the trusses looks good. But i am having trouble determining how to check these connections. The plates look like galvanized sheet metal (not sure the thickness yet, i will use a micrometer to get this) and then they are just nailed onto the webs and chords ( i think with just 1 1/2" nails since none are protruding from the back side).

Can anyone give me info or send me to a place with info on how to quantify this joint? I dont want to have to install OSB/Plywood gussets on every joint unless this is absolutley neccessary.

Thanks for the help

RE: How to qualify this nailed plate

Looks like 20 gauge "repair" plates that have been sold for a number of years in hardware stores.  Normally only good for repairing fences, garage doors and the like.  Looks like something a Do-it-yourselfer did!!

This is SO not good!!

Nails might be good for about 50-75 lbs each.  Are plates on both sides?? Resolve the axial loads in all members and then get to work.  You will probably NOT like the results.

Generally, the heel joint (at wall where ceiling and roof rafters meet) is the most critical.  Depending on the span and loads required, this peak joint might actually be OK??

Google TPI (Truss Plate Institute) and Alpine Engineered Products and Mitek.  The last two are truss plate mfgs.  You may learn something useful.

Can you find out who built them?? Also need lumber grades - should be stamped on each piece.

BTW - GOOD LUCK!!

RE: How to qualify this nailed plate

Agree with Mike.  The plates are just sheet metal mending plates.  Further, it looks like there are too few nails.

 

RE: How to qualify this nailed plate

(OP)
I understand now what these plates are and that they are more than likley no good. This is all fine i will design an OSB gusset. Question is now, is it acceptable to keep existing plates on there, assume they are worth nothing , but then nail through them with the new OSB gussets?

RE: How to qualify this nailed plate

Yes.

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