hey all! i have a workshop to which i have fitted a car lift...but i now
need to remove the ceiling ties(to which there never was a ceiling fitted),
and the purlins which are half way up the 45degree rafters, in order to be
able to lift the car into the roof space suficently enough to allow standing
room underneath. i know the only way is to suficently strengthen the
rafters so that they dont sag and install collars higher up. but i want them
as high as possible..not just the third of the way up that is recomended.
so my thinking is to strenthen the rafters with u chanel 3 or 4 mm steel
cupping and screwed or bolted to the raters. then using steel strips as the
collars but higher up...say in the top third. has any one any experience of
this method or any comments? all very welcome! (arcitect due to advise
later next week..but would like some feedback on my ideas)
Yea but think about what those horizontal supports hold together, THE
WALLS from separating. Depending on type of construction you may be
sorry if you do it wrong when it loads with snow. You should consult an
architect, so if it falls its his buck - liability for steering you
I was hired to remove a wall, I told the customer to hire an architect
to aprove it. He did, the ceiling and beams fell down, the architect
You are removing the bottom of the triangle. Rafters develop a
great deal of lateral thrust, trying to push the top of the
outside walls out. The ceiling joists prevent this. The collar
ties help prevent it and help stiffen the rafters.
You will need to compensate for this structural removal. One
method would be to create a structural ridge. This project will
not be inexpensive.
Keep the whole world singing . . . .
DanG (remove the sevens)
<< i have a workshop to which i have fitted a car lift...but i now need to
remove the ceiling ties >>
Prediction: your architect will run the numbers and tell you to tear the
structure down and rebuild with the right ceiling height. Your building
inspection department won't issue a permit. You will wind up building an
addition of the correct dimensions and moving the lift to that location with
proper permits, etc.
Automotive lifts require a 14' or better clearance. That should have been noted
in the installation instructions. Let us know how it turns out and good luck.
As others have posted, you are unlikelty to get any permit approved.
45 degree is a steep roof and thus has considerable force trying to
spread the walls. Your proposed steel reinforcement really wouldn't
do the job IMO.
One approach to consider if your architect says your proposal won't
Tear off the roof, add knee-walls to raise the walls high enough to
put on a normal roof. Yeah, spendy but not as much as finding your
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