Joists Sistering Garage Door

Fine homebuilding notes that 2 inch by 6 inch garage joists will support a weight of up to 50 pounds per square foot.

Joists sistering garage door.

Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. I have 12 2x6 floor joists that are water rotted or damaged by termites only on the ends where the joists lay on the 2x4 sills the sills have rotted and are gone leaving the joists floating in the air. A day until they re level. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.

Although you can construct a garage using thicker stronger joists 2 inch by 6 inch joists are sufficient for most garages even if you intend to build an attic storage area above your garage. Jacking them up too fast may cause cracks in the walls and floors overhead. Pull up on the joist until the top of the joist is flush with the bottom of the 4 4. The problem with sistering a garage door header is that you commonly cannot effectively put replacement pieces on both faces of it and bolt through assuming it is cracked not rotted so it the bad one be left in place.

How long should the sister be and what is the best method to secure t. Lay a four foot 4 4 across the top of the sagging joist and two adjacent joists. That way the new and old joists share in carry the dead load. Best practice would be to jack each floor joist to remove the dead load deflection install the new sister and then remove the jack.