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MaynardKrebs
Heave Steve, for the good of the country
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join:2009-06-17
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reply to raccettura

Re: [Other ] Weird crack on edge of ceiling

It's most likely a roof truss issue caused by insufficient insulation at the edge wall due too little insulation in that area.

In order to avoid this type of problem a truss known as a "raised heel" truss is the type which should be used. This type of truss allows a full (R50+) to be installed right up to the edge of the exterior wall »www.neo.ne.gov/home_const/detail ··· s/42.htm

Conventional trusses don't provide enough height for insulation to eliminate thermal contraction of the ceiling chord - which is likely causing the ceiling cracks.


Msradell
P.E.
Premium
join:2008-12-25
Louisville, KY
said by MaynardKrebs:

It's most likely a roof truss issue caused by insufficient insulation at the edge wall due too little insulation in that area.

In order to avoid this type of problem a truss known as a "raised heel" truss is the type which should be used. This type of truss allows a full (R50+) to be installed right up to the edge of the exterior wall »www.neo.ne.gov/home_const/detail ··· s/42.htm

Conventional trusses don't provide enough height for insulation to eliminate thermal contraction of the ceiling chord - which is likely causing the ceiling cracks.

Unfortunately this isn't the solution to the OP's problem. It's helpful to know if you are doing new construction but certainly isn't a viable option when the home is already built.

kherr
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join:2000-09-04
Collinsville, IL
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reply to MaynardKrebs
I wonder how many houses I've worked on in my life (plumber/electrician) and have yet to see this type of truss used. We've had service contracts (5k+ sq ft vacation homes for general maintenance in addition to electric/plumbing) with many of them and have never seen any such damage due to incorrect type of trusses. In central MO you see swings from min to max in temperature and humidity.

It looks to me from the pics that this is not an outside wall and this would not come into play. Without seeing other things, I'm leaning towards a bad installation/tape job or settling issue.


linicx
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join:2002-12-03
United State
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I loved my 110yr old Craftsman Style Bungalow in MO. You would too; it was incredibly easy to repair. The walls were a foot thick. The basement had a coal room plus a coal-to-gas conversion furnace, and the attic had a bat patrol that lived there. I was never cold in the winter, and the bats caught the bugs in the summer.

I have a house a bit like this now. Part of the cracks came as the house settled. Part was caused by the type of old plasterboard that was used, and part caused by improper ventilation in the attic. The insulation installers were kind enough to not use baffles, but then filled the soffit vents with insulation.
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