Drilling into soft bricks

[liam546]

My Victorian house is made from bricks which contain holes through the depth of the brick. (21 holes in each brick in total) so when I try to drill into them or screw a screw into wall plug the brick just cracks and breaks away.

I'm trying to fix a plastic outside vent to accomdate a new inline fan. I need to crest a circular hole in the gable end which is 9 inch solid brick. I've read about drilling a series if small holes and chiseling out. This might work to create the hole but the fix the outside grill it has 4 holes for fixing with screws but I know the bricks will just break away if I do this

I guess I need an alternate way to fix this plastic grill to brick other than wall plugs and screws. Can anyone suggest anything?

 

[footprints]

Safest way to get a clean cut would be a diamond core drill 115mm dia or whatever your vent requires.
No hammer action on the drill just a smooth cut, you should be able to hire one you MUST hire the correct drill with a clutch with it or you can break a wrist if it snaggs.
Drill from a platform not a ladder or simply cut through from inside, a diamond drill has minimal break out on the exit side.

As opposed to other ways a diamond drill is sooo easy!

 

[liam546]

Thank you so much. I'll look into that then.

Also having same issue tacking up plastic conduit to the chases I have created for the electrics. Are there any adhesives out there that stick plastic to brick. I only need it to hold in place and sit just within the chase so the plasterer can go straight over them

 

[footprints]

http://www.screwfix.com/p/sticks-like-sh-t-290ml-white/22070#

Does what it says on the tube

May need to hold / wedge in place for a short time if there is any spring in the conduit.
Most similar building adhesives will do brick and plastic, I would avoid silicone based ones though your skim plaster will not stick to it.

 

[liam546]

Thank you once again. Really appreciate the help. I'll look at both of these and hopefully they will work perfectly.