Sagging Roof Rafters-Long-Sorry
Well winter is leaving us and my husband and I are embarking on the next phase of our 180 year old home repair/renovation/restoration. For those of you who haven't seen my prior posts, we started in the basement and have installed new support piers. From those we have straightened the 1st floor, re-framed the load bearing walls on the 1st floor and straightened the 2nd floor.
Now we're ready to tear off the at least 3!!! layers of shingles and install a new roof. The question is the all roof rafters have approximently 1/2" of sag in the 20'. There are existing knee walls at approximently 9' from the outside walls. The ridge is straight. Is this amount of sag acceptable or should we try to straighten them? I've read that very old wood sometimes won't straighten, but rather will lift off the outside walls when you try to jack.
Anyone have experience or input on this?