Joists Sistering Garage Door

Reinstall the blocking on both sides of the joist.

Joists sistering garage door.

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. Attach a bar clamp or deck devil to the bottom of the joist and to the top of the 4 4. 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.

Nailing two 2x4s together will work to span about three joists unless the sag is under a weight bearing wall. 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. Best practice would be to jack each floor joist to remove the dead load deflection install the new sister and then remove the jack. 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.

Lay a four foot 4 4 across the top of the sagging joist and two adjacent joists. If you don t do this the new joist won t carry any of the existing load. How long should the sister be and what is the best method to secure t. Set a hydraulic jack and post under the beam and jack up the joists about 1 8 in.