Reinforcing 2x4 Attic Joists

Our house has almost exactly the same thing.

Reinforcing 2x4 attic joists.

I want to finish this space with drywall walls and ceiling and also a drywall ceiling in the garage under the joists. Beefing up attic joists for living space. I talked to a structural engineer and he advised to sister the existing 2 4 joists. With the 2x4 joists 16 inch centers running the 15 foot width.

My ultimate plan is to sister the joists to make a sturdier attic ceiling blow in insulation on the roof and put plywood across the joists for a storage platform for my boxes christmas decorations etc. The attic joists are only 2x4s and are 27 inch on center i double checked. There is a 1 2 plywood sub floor on top of the joists. As you can imagine the floor bends a bit when walked on there are tongue and groove planks over the joists in the attic for a floor.

In the case of 2x6 joists you can pair them up with additional 2x6 joists by nailing them together side by side. The existing ceiling joists are 2x6s clear spanning about 11 feet 3 inches. Decided to use 2x4 at 16 inch centers as joists. 2x10s are the code today.

Nail the board to the joist and rafter with two nails at each spot. Rather than sistering in. I need to convert an attic to livable space with minimal disruption to first floor habitation. 20 and are 16 on center.

Place the board vertically with the ends overlapping the ceiling rafter and the joist. I have places in the attic where there is a 12 foot span only supported by 2x4s. Sistering is the process of adding a new joist next to each existing joist. Plan is to use attic for storage not for living.

How to reinforce 2 4 attic floor joists. Senna posted in construction techniques on may 26 2004 09 05am just installed an attic ladder in 90 year old house. 2x4 s actual size spaced 16 on center running the width of the building uninterrupted with the ends resting on top of the wall top plate. If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists.

I d like to double my ceiling joists to make my attic space easier to work in for electrical plumbing and for lightweight storage. Each joist is strong enough to support my weight 175lbs concentrated in a 1 segment of the joist and.