I plan to increase the height of my garage by about 6' to build an extra
storey, I'll be re-using the existing roof as it is, instead of
dismantling the whole thing and then rebuilding I thought I might jack
the roof up and slip some extra wall underneath, what do you think?
I must admit it is the sort of thing I would try. It depends on
construction, but it could be done using triangulated acrow props (or
they will tip sideways) and lifting a foot or so at a time, then
propping or building underneath. Weather might be a problem, one good
blow of wind and you have a disaster, safety of you while lifting is a
big thought too.
Assuming the roof is simply sitting on the walls at the moment, it must
be structurally stiff enough already so that tying the A frames together
along the two long wall lines ought in principle to make the whole thing
rigid enough to lift.
Even then, you would probably need Acro props at the foot of both
sides of each frame, plus some way of preventing the whole shebang
from moving off sideways. It would mean quite a lot of materials,
a great deal of care, and probably take a surprisingly long time,
but I'm sure it's both possible and could be done safely.
But, given the above and the fact that even though the risk of
losing the whole lot might be small, the costs of doing so would
be very high, I'd be inclined to dismantle it, build up the walls
and put it together again on the new structure.
Interesting experiment though, I'd like to see some piccies if
you do try the jacking approach (successfully or not!).
Me too! I think I'd put guy ropes to make sure it doesn't tip and only lift
an inch or two all round at a time. Let's face it, whole houses have been
moved from one site to another, particularly in the States. This roof job's
a doddle compared to that. Yes, the more I think about it the more I like
I don't really see why not. Hydraulic lifters are available. Would need a
few load spreading beams to give stability. I've seen a whole house lifted
and transported in the US, so a roof ought to be easy! I'd expect the ridge
tiles to come unstuck and need recementing. Anyway if it did fall down, you
just say the appropriate words and put it back together again! It does have
the advantage of being able to work in the dry. Wind loading might be a
stability problem. Is it tied into any other roof/wall?
David @nospam.cod wrote in message ...
Seems like the obvious route is to jack only one side up, add
brickwork, let it set, then jack other side, add brickwork, and walk
it up like that. I assume you'd need to attach a very hefty beam along
the length of the thing first so that all the frames are lifted, no
use just lifting some of them.
Should work OK, I'd try that anyhow. Guarantees are a whole nother
matter tho. Better make sure you got hard hats on!
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