Cutting door in block wall

DublinDilbert

Hi All,

I'll be cutting a new doorway in a 100mm internal block wall in a few months. I know I can use the large grinder, would be a lot of dust.

Has anyone used the brick cutting blades in the reciprocating saw? I assume these would fly through the cement joints?

I see the blades are about €28 on screwfix...

doolox

If you are dealing with a wall that is supporting upper floors or a wall on an upper storey then you will need to put in a lintle or Steel RSJ to span the open space created to allow for the door. You may have cracks or wall breakage over the door if you do not do this properly.

Bonzo Delaney

You could hire a wall chaser and vacum ( Hilti ). It'd cut in 45mm cut from both sides and it'd only leave a small bit of block work that'd just snap off
Used this method on a job recently where I couldn't use a con saw or a grinder inside because of fumes, dust and water issues. Worked out grand minimum dust and easy enough to cut out for lintel also safely. Once I got the first block out the rest came out handy enough with a few belt's of a sledge.

M.T.D

I've used the angle grinder vacuum cleaner combination before. I had taped a sheet around where I was working to minimise dust spread but the vacuum caught almost all of it. Use an old vacuum, I had a Black and Decker "aquavac" that I used in the garage.

DublinDilbert

Hi All,

Thanks for the suggestions. I've done a few of these before and the dust is always the problem with using the large grinder. I normally use a 50-60mm core drill to drill out the ends where the head is going and drill above the door for a couple of needles for the acro props.


I was wondering if anyone had tried these:- http://www.ie.screwfix.com/bosch-brick-sabre-saw-blade-240mm.html

I plan on cutting the mortar joints as much as possible, this should fly through the mortar, then maybe use the large grinder for every second block.

CJhaughey

You need one of these:https://www.youtube.com/watch?v=DguNavRgRtE