On 2006-11-20 14:35:12 +0000, "Antix" said:

yeah, saw those on screwfix but don't quite understand how you use
them...There's the resin, you pump that in the hole, but what 'fixing'
do you use ? Those resin studs worry me...you just push them in and
hope the resin grabs the thread of the stud ? how do you know if the
brick hasn't soaked up all the resin too quickly to have anything left
to grip the stud by the time you get it in the hole ?

maybe I'm missing something very basic here :-)
Ant.

The hole is drilled generally 2mm larger than a threaded stud which
will be used
as the fixing.

The procedure is to drill the holes, thoroughly clean them with a
vacuum and inject some resin. One of them is a resin/mortar mix which
is a two part material in a dispenser. There is a special nozzle
with a spiral piece of plastic inside which mixes the components as you
inject.

You then insert the studs with a gentle twisting motion making sure
that some resin is forced out of the hole as you do so as to ensure
that the hole is filled properly.

The resin cures in a few hours but is fully load bearing in 24hrs.

It is quite viscous and will not soak excessively into bricks.

If you had hollow bricks, there are special sleeves that you can get
for the studs to retain the resin close to the stud, but on an 1860
house this is unlikely.