Cutting Doorway in External Concrete Wall

Are you sure about it being pervious concrete as that is usually used on the ground?

 

I thought concrete was meant to be 'impervious' !

Mr. HandyAndy - Really

 

Where abouts is the house, ???

 

Not all concrete is impervious, some concrete is pervious, designed to be porous, allow water to soak through to drain away,used for drive footpaths, runways, etc.

 

It's some where either really dry or really wet.

 

When he said concrete, I wondered Cornwall and a mundic house.

 

He probably got an old converted nuclear bunker!

 

He's probably thinking where the f'off have I come to...

 

Done a runner to D** .C**

 

I think the OP is actually referring to a "no fines " wall construction. (old council houses were built using this method) A right nightmare to work on. Had a kitchen to fit in a "no fines" house once. Could hardly drill the external walls to fit the wall hangers for the cupboards. (well at least a straight hole)

 

I'd second that for no fines concrete, an absolute swine to work on. You could knock an opening in it but you would have to cast a concrete lintel in-situ. Be careful though as when you start knocking it, it comes away in bits and sometimes big bits. Use a cut off saw if poss.

 

Thankfully I have not come across "No Fines Concrete"

For future reference what have you found to be the best products to Drill / Cut "No Fines Concrete" ??

 

Probably a cut-off saw with a diamond blade, hire one from the local hire shop, be prepared for the dust cloud though. https://www.speedyservices.com/15_0230-h-masonry-cut-off-saw-2-stroke-300mm-12in

 

http://en.m.wikipedia.org/wiki/Wimpey_no-fines_house

 

Something like this may be beneficial then

 

What's that, Welsh?

 

It's a Bish Bash Bosch Dust Extractor system