Fixing backbox to aircrete / thermalite

[Deleted member 112675]

Hello All

When fixing a backbox to soft airated blocks like aircrete etc, do you use special fixings or is a pair of normal brown plugs typically good enough ?

Thanks in advance.

 

[Leesparkykent]

I normally use red plugs with number 10 head screws when fixing to thermalites

 

[GBDamo]

Ive pretty much moved to 1.5" 10s for everything, with red plug unless the head is going to be visible.

Drive in with inpact and nip up by hand, learnt that from cracking surface boxes.

 

[bill01803]

1.5 x 10 screws into the correct plugs - solid as a rock

 

[sam400]

Yea ‘reds and 10s’ for me too

 

[Pete999]

Hello All

When fixing a backbox to soft airated blocks like aircrete etc, do you use special fixings or is a pair of normal brown plugs typically good enough ?

Thanks in advance.

Dampen the hole you have cut for the box:
Drill some fixing holes:
plug and add some long fixing screws:
Whack in some Compo (BRICKIES MUCK) remove long screws. set box in said Compo reset some screws, make sure box is level , fill in the rest of the hole with Compo, wait until Compo has set tighten screws and Bob's yer Uncle, or in this case box fitted.

 

[multimick]

drill holes off hammer 5.5mm

 

[snowhead]

Dovetail screwing as well if you want extra security.

 

[telectrix]

make box cut out dead tight then fit box with hammer.

 

[suffolkspark]

I used to use no.8 1 1/2" screws with red plugs.... for years... then I watched another spark plowing screws straight into the blocks with no plug.... that's rough I thought.... but having tried it it holds aswell as plugs! Tends to be rendered in pretty soon after so now that's what I do

 

[telectrix]

or use wall dogs.

 

[davesparks]

1 1/2" x 8 screws into red plugs with a 5.5mm hole. Most wholesalers stock tubs of 500 plugs and screws these days.

 

[Deleted member 112675]

As ever thanks so much guys. Looks like reds and no 10 wins the day so that is what I will use.