Attic Joist Reinforcement

Sistering installing new larger joists next to the existing ones is one way to bring your attic floor up to code.

Attic joist reinforcement.

A raised platform of lumber in dimensions of 2 4 or 2 6 with insulation placed between joists and covered up with a 12 inch plywood helps build the right flooring. Now it is time to use some wood and screw it into place on the original joist as well as the cross beam. How to reinforce an attic floor with sister joists clear the joist spaces pull out all insulation and any debris from all of the joist spaces so you can see the full. Installing flooring material over the attic doesn t quite leave room for the recommended insulation space needed to provide efficient home energy.

But 2x8s should work fine and will save labor and materials. In massachusetts attic floors must support at least 30 lbs ft live load the same as bedroom floors if the attic is accessed by means of a fixed stairway 780 cmr 5502 3 1 use a span table to determine the necessary joist dimensions given their span length spacing wood species and grade. You can strengthen the roof to prevent damage by adding braces to the roof rafters inside your attic. The solution is simple sister on an 18 gauge 1 5 8 x6 steel stud material to act as a joist running plate to plate.

This is a fairly basic project that can help protect your roof but consult a structural. For slightly better bracing across the entire depth of the assembly you could instead use 2x12 blocking or double 2x6 blocks one layer for the top joists and one for the bottom. Step 4 reinforce the floors you will have to use a very sturdy piece of wood or some steel plating to reinforce the floor joists. Toenail the blocks or end nail through the joists to tie everything together.

Measure the old joists measure the length of the old joists and note how much they overhang any supporting walls or. Screw the metal joist to the existing wood ceiling joist and to each plate and you have very effectively reduced the load deflection of any stored attic loads for little cost. If the existing joist system is very close to being sufficient to support a new attic flooring. Often existing joist bays are filled with electrical and heating ducts that will need to be relocated.