Truss Roof Tear Off

Standstrong

I got the prints today on a truss roof that needs to be torn off due to span.
Plus 3 new room additions..

Roof Sheathing is only 38ths and is to be removed They want to keep the ceiling in the home, but the bottom chord doubles as the CJ. (RANCH)

My question is this??

Should I try to sister something across that bottom chord and try to clip the top of all the trusses off? (24''o.c.)Since there is sag in the bottom chord right now.?

IF I DID....
I would certainly run into problems with 16'' oc NEW rafters that I am installing as the new roof.

I say put a D-8 to it and give me some green plate.

I need a cost-plus bid, I'm thinking for the hiddens, but still need a number on high-end for a realistic cap.

anyone had this experience.

house bldr

Glad its you an not me! Some hiddens might be--boxes fastened to the joists that would be in the way,insulation would surely have to be removed,popping nails on the inside while trying to sister them[unless you clamped and screwed everything],wiring running randomly through the attic that would be in the way.These are just a few off the top of my head,probably just scratching the surface!

Glasshousebltr

Buy many sawzall blades young Skywalker.

Bob

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Bob

joasis

If you are on a cost plus, you are at least safe from some unknowns. If the bottom chord of the trusses is currently sagging, and I assume they want the ceiling to remain due to dust? noise? debris?...I would definately sister something up there, or run I joists...after all, when the weight comes off, the sag will not magically disappear, and then you can get a ceiling replacemt sold after then see this. Easy to do since you will have the joists next to the existing chords.

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reveivl

You don't say what type of truss is there presently, but when you cut the rest of the truss away the ceiling is very likely to sag even more. It will have to be dealt with as an integral part of the job. I assume that you are not creating living space above? Could you jack up the ceiling, put new trusses beside the old and nail the original bottom chord to the new?

Or you're left with spanning the distance with a single member (large) or effectively building a truss to support the ceiling. Probably quicker (cheaper) to go with trusses right away. Plus less bs from inspectors.

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Joe Carola

I don't understand how you have a set of plans for this that speck new rafters 16" o.c and no specks on what your supposed to do to try and keep the ceiling.

What does the plans say for new ceiling joists?

There's no mention at all as to what you should sister next to the bottom chord of the truss before you cut them off???

This is no little project that YOU should be guessing like you're doingat what to do to support trusses that your cutting off and trying to save the bottoms.

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Joe Carola

Standstrong

I don't understand how you have a set of plans for this that speck new rafters 16" o.c and no specks on what your supposed to do to try and keep the ceiling.
Ya, I've had prints showing the existing floor joists the wrong way. A quality print is key.

What does the plans say for new ceiling joists?
Note: All new ceiling Heights to match existing unless otherwise noted.

There's no mention at all as to what you should sister next to the bottom chord of the truss before you cut them off???
V.I.F. (The sistering is was my initial idea)

This is no little project that YOU should be guessing like you're doingat what to do to support trusses that your cutting off and trying to save the bottoms.

I came up with tearing off everything and using the new Rafters for the ceiling inside and having the collar ties double as a CJ. (tray) Everyone seems pleased thus far. Will Advise.

Joshua

Is the bottom chord of the truss a single wooden member or is it multiple pieces spliced together with a connector plate? If the later, you will definately see additional deflection in the ceiling when you remove the upper sections of the truss. Trusses are designed with triangulation in mind. Removing the upper portion of the truss will remove the support for the bottom chord and create defletion.