Fixing backbox to aircrete / thermalite

D

Deleted member 112675

• Nov 14, 2019

• #1

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

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• Nov 14, 2019

• #2

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

 

GBDamo

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• Nov 14, 2019

• #3

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.

 

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bill01803

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• Nov 15, 2019

• #4

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

 

sam400

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• Nov 15, 2019

• #5

Yea ‘reds and 10s’ for me too

 

Pete999

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• Nov 15, 2019

• #6

sparkless2 said:

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.

Click to expand...

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

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• Nov 15, 2019

• #7

drill holes off hammer 5.5mm

 

snowhead

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• Nov 15, 2019

• #8

Dovetail screwing as well if you want extra security.

 

telectrix

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• Nov 15, 2019

• #9

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

 

suffolkspark

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• Nov 15, 2019

• #10

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

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• Nov 15, 2019

• #11

or use wall dogs.

 

davesparks

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• Nov 15, 2019

• #12

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.

 

OP

D

Deleted member 112675

• Nov 17, 2019

• #13

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