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I cant understand this math. ive been over and over it. Each time I get a little further, then I loose it again. ref: How to calculate rafter thrust? -Help! at http://www.eng-tips.com/viewthread.cfm?qid=105386 Can someone help me figure cable load? 4/12 24" rafter spacing. No...

I have four sagging rafters in garage in my 1952 home. They are 2x6 and all side by side. All four have knots in about the same location, resulting in sagging. I got 4 2x6s to sister these, but that's a lot of weight to add side by side. So, Im thinking of using angle iron, as least for two...

shown in the 3rd pic. to add the hurricane straps.

I need to secure these rafters to the cinderblock top plate. They are just toe nailed in now. I want something stronger that i can screw in w/o removing the planking. Any ideas? I might install rafter ties, but Im looking for alternatives. pics...

three rafters where the roof sags have a measurable curve to them. 3rd one is totally destroyed by termites. Every place that I touch it, it crumbles.

what about the sag? Im gunna have to PUSH it flat with this new rafter. Will not the old sagging rafter push against the new, maybe sagging it too?

If I make it the same length as the existing ones, it wont fit. There will be no way to install it w/o removing the roof plankings. My only idea is to make it shorter and cut the piece that sits on the block wall, cut the angle 1.5" higher. This will allow me to slide it in further, then...

Whats the best grade bolts to use? I think four would be good. Washers too.

Whats the best grade bolts to use? I think four would be good. Washers too.

"simply screw a suitable steel plate (galvanized hold down bar or similar) with 2" - 2 1/2" rust proof screws." Maybe. Others suggest a sister 2x6. Some say 4-6' long, others say the full rafter length.

"but you could screw it/them together" How would that increase strength?

qualified sources instruct to use subfloor adhesive rated apa-afg-01 to adhere roofing planks and gable support members for added strength during a hurricane. Insurance companies give discounts for such after inspection. While I was doing such a few years ago, I noticed that split, so i squired...

white stuff subfloor adhesive

http://www.diynot.com/network/user_album_update.php

so where are the pics that i attached?

house built 1952. A few rafters cracked and one is split. Im considering adding supports. Advice? tks, pa