RockyMtnBlue

Do I need to use mending plates?

RockyMtnBlue

I will attach the two beams with two 1/2 bolts (a total of 4 bolts). Do I also need mending plates?

nealtw

No the bolts are plenty.

siriuschaos

Maybe a little construction adhesive if you have an open tube, on the ends of of the 2ply beams where they will meet. Will help keep the entire joint water tight. A few screws with the glue will eliminate the need for bolts

RockyMtnBlue

Thanks... No mending plates and construction adhesive.

inspectorD

Sorry, but I would keep the bolts. Screws have no shear strength and can snap under load. I know it's easier, just no where near as good.

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RockyMtnBlue

Oh yes, did not mean to imply that I won't be using bolts.... Bolts and construction adhesive, no mending plates.

GBR

Bolts will bring you up to minimum Code, as will post bases; http://www.awc.org/Publications/DCA/DCA6/DCA6-09.pdf Use some Grace I&W shield on the post bearing area, p.t. wood is not waterproof: http://www.greenbuildingadvisor.com/blogs/dept/building-science/pressure-treated-sill-plates-and-building-code

You need stand-off post bases for the capillary break they provide. Nails, not screws, for the sistering- as said. Use the I&W on the built-up beams top under the joists above for less water intrusion, or at least a bead of caulk- top only to drain below. Run a bead under the outside edge of the house ledger for a drip edge to stop water from working back to the house.

Gary

BridgeMan

Well-spoken, Gary. And if it were mine, there'd be a sistered PT vertical 2 x 4 on the back of every chopped up support post, extending below the break point. Just to minimize the damage when the little lady of the household smacks the deck with the garden tractor at full speed.

RockyMtnBlue

Thanks for the feedback ... I'm learning something for every post. Question about my beams.. I'm attaching (sistering?) two 2x10s. The book says screws about 24" apart. From comments here, I gather that I should use construction adhesive and nails. I read that I should use 3 nails every 16". Comments?