Exterior basement wall won’t hold a plug at all; what is this brown material?
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phario
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Exterior basement wall won’t hold a plug at all; what is this brown material?

by phario » Sat Nov 26, 2022 10:19 pm

I’m trying to put some plugs into an interior wall in a late 1800s or early 1900s basement in the south west.

This (https://imgur.com/a/0oPVq7T) is what happened with both a 6mm diameter red rawl plug and also a Fischer duo power fixing. Plugs are about 30mm length. Basically the fixing completely pulled out due to a crumbling wall.

The material is very soft, almost like hard mud.

Can someone explain:

1. What is the brown material I’m drilling into and why can’t it hold anything?

2. How do I get a fixing into this? Do I get a much longer plug, say double the length? Will I eventually encounter hard masonry if I drill deep enough?

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