I have an arch of cut stone that creates the front door to my house. One of
the stones at the top of the arch has slipped from its mortar and sticks
down an inch or two. Is there an adhesive I can use to stick it back into
place rather than using mortar? The orginal mortar is intact around it (not
broken, cracked.) I am hoping to use an adhesive that will keep me from
having to try to match mortar color.
Keystone says it all, the " Key"... Jack it in place , dig out bad
mortar and mortar it in place, You realy can`t think caulk will do, can
you. Loose that stone and all will follow.
You are best to get a pro, since you even consider caulk, if the Key
mortar is bad so is alot more. Do not learn on this job.
As Ransley says, the key is essential to the whole arch holding up, so there
is some danger involved. If you are handy and experienced, you could us a
bottle jack and 4x4 posts and T-joint to hold up both sides of the adjoining
stones, adjusting the pressure just enough to hold them securely, then
remove the keystone laterally, if possible. Chisel off mortar on butting
stones and on keystone, then pre-moisten all surfaces with water, soak
keystone in water a few minutes, then butter all surfaces with bagged ready
mix brick mortar mixed to a thick paste. Place keystone in gap, trowel and
finish. Brace the stone so it is exactly flush with the underside of the
arch, and let mortar set a few days before removing braces. You will need
finishing tools for the mortar joints, and don't even consider this repair a
DIY project if it is your first attempt to repair brick!
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