On 19/07/2019 03:51, % wrote:
On 2019-07-18 7:47 p.m., Bill Wright wrote:
On 18/07/2019 21:38, Tim Lamb wrote:
I am planning a single pitch roof fitted between two existing cavity
walls (house/old garage) and am contemplating fixing to the walls
rather than using vertical supports from foundation pads.
The outer skin brick is sound but uses wirecut extruded brick with
lots of internal holes. Any drilled fixing hole has a 50% chance of
finding a cavity!

Any suggestions. Concrete screws with the holes pre-filled with
resin? or?

If you have a loose brick you might be able to see where the frogs or
holes are and avoid drilling bricks at those locations on each brick.

You could use anchor bolts long enough to go right through the bricks,
and anchor on the far side. But if you do that drill carefully after
your bit has passed through the hole so you don't blow the far side of
the brick.

Since the load will not be 'pull-out' I would have thought 10mm holes,
blue plugs, and No 10 or 12 woodscrews, fixing to the masonry between
the hole in the brick and the surface, would be fine.

Much depends on the hardness of the bricks.

Bill

just the climate could make all the difference

I would point out that virtually all houses in the UK with cavity walls
its the inner wall that supports the roof and not the outer wall.

Even with timber framed houses.

So make sure the structure can support the roof.


The roof is normally tied in place with steel L brackets about 1m long
against the wall and 300 mm on the wood work of the roof. This may vary
I haven't looked inside many older houses but you can see new ones being
built.