Wall plugs into Thermalite blocks

David.WE.Roberts · 2013-10-04T13:49:39+00:00

Just hung a couple of identical bike racks on an external wall. One into brick, the other into Thermalite block used to block up an old doorway. The fixings are 4 off 5* 50 Turbogold screws into brown Rawlplugs. I know the screws just go to the end of the plugs because the plugs pulled out of the Thermalite blocks. So what is the best way to achieve a strong fixing? I can get M5 rawlbolts but these may split the block. Inner wall will also be Thermalite so special long screws and pugs may not work, although I do have some frame fixings. Cheers Dave R

Oct 04, 2013 21 Replies

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Tim Watts 12 years ago

On Saturday 05 October 2013 22:12 Tricky Dicky wrote in uk.d-i-y:

+1 on the Fischer plug - thay are very good in thermalite.

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Andrew Gabriel 12 years ago

I found instructions for plugging thermalite somewhere once. Two important things - don't use a masonary bit and don't use hammer action - these both destroy the structure around the hole.

You need a parallel sided cutting bit, to drill a clean sided parallel hole. A cheap bit is usually fine, as these don't have a long life drilling into cement anyway.

A soft plug (e.g. plastic) may distribute forces more evenly, avoiding pressure concentrations which canbreak the block structure around the hole.

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