Drilling through a wall?

[-C-]

I need to drill a couple of holes in a wall for waste pipes in our bathroom. Having checked, the wall is approx 15-18cm thick, standard construction on the extension of breeze block - cavity - brick (I think)

The hole needs to be 40cm in diameter from what I understand?

As my little home drill is somewhat less than capable, its off to the tool hire shop for one.

Is it going to be something like this I need? http://www.brandontoolhire.co.uk/directory/prodVie...

Cheers

[Plotloss]

SDS Drill and a 40mm core bit.

(I'm assuming you meant 40mm not 40cm)

[robinhood21]

Tell the the guy in the hire shop what you are going to do and, am sure he will hire you the correct equipment.

ETA: Did not see your post, Plotloss.

Edited by robinhood21 on Tuesday 14th April 15:53

[-C-]

Sorry yes, 40mm!

[mk1fan]

It's going to be thicker than 18cm if it's a cavity wall. As suggested tell the tool hire shop what you're wanting to do.

[bramley]

Not something I've ever done but iirc the proper kit for this sort of stuff should have some kind of clutch mechanism so that if the bit bites and jams into the brickwork it doesn't flick the drill round and break your hand/wrist/finger?

[B17NNS]

A 40mm core bit and SDS drill with a clutch is what you want.

Fire a pilot right through first and then core drill the outer leaf from outside and the inner leaf from inside.

[Simpo Two]

Plotloss said:

SDS Drill and a 40mm core bit.

Awesome kit - goes through a wall like it was cheese!

And yes, I've heard the clutch/wrist thing before - don't know how true it is but SDS drills are very powerful. When I was using mine to take tiles off the kitchen wall, it cracked the other side

[Gingerbread Man]

SDS and Core bit is the right way.

You'll want a clutched drill as mentioned above. Otherwise when it snaggs on brick work when drilling, the drill bit will stop twisting and the drill will start. Not what you want, and definitely not what you want on a ladder.

[-C-]

Cheers everyone, looks like its a task for the weekend then

When plumbing in waste pipes to sinks is there an 'order' I should do it in? Or just get stuck in?

[mrmaggit]

It's normal to work from the "fixed" end, ie the soil pipe, then work towards the "moveable or open" end, the sink/bath.

[mk1fan]

You don't want too long a run from the soil pipe either. I think 1.7M is the max unvented length for 32mm pipe. 40mm Pipe can be run up to 3M but you'll need a bigger hole through the wall - 50mm should be fine.

[-C-]

It should be only around 1-1.5m from the sink to the soil.

Next question (should have thought of this earlier) 32 or 40mm? This is purely for bathroom sink waste.

[mrmaggit]

Sink waste is 32mm, bath waste 40mm.

Editted to add washing machine is also 40mm.

Edited by mrmaggit on Wednesday 15th April 10:37

[garycat]

If you are going to be doing any more work it may be worth buying an SDS drill - £40 from Screwfix, with a 95% good review rating.

http://www.screwfix.com/prods/58494/Power-Tools/SD...

[-C-]

mrmaggit said:

Sink waste is 32mm, bath waste 40mm.

Editted to add washing machine is also 40mm.

Edited by mrmaggit on Wednesday 15th April 10:37

Cheers for that, 32mm it is then.

Interesting point re the washing machine waste, I was planning on using one of the combination sink/washing machine U bends, when I get round to doing the kitchen. I presume in this case its a 40mm then, having not checked?

[mrmaggit]

-C- said:

mrmaggit said:

Sink waste is 32mm, bath waste 40mm.

Editted to add washing machine is also 40mm.

Edited by mrmaggit on Wednesday 15th April 10:37

Cheers for that, 32mm it is then.

Interesting point re the washing machine waste, I was planning on using one of the combination sink/washing machine U bends, when I get round to doing the kitchen. I presume in this case its a 40mm then, having not checked?

Correct! We'll make a builder of you, yet.

BTW, by sink waste, I mean hand washbasin. Kitchen sinks, because of their size, also use 40mm waste pipe.

If it helps, showers are 40mm too.

[-C-]

Thats fine, I should have said hand basins for the bathroom. So, 32mm pipe, 35mm hole in the wall be ok?

Point taken ref kitchen sink, will worry about that next week! Got to play juggling the pipework around the units yet...

Not sure about becoming a builder, looks like far too much hard work

Shower is already done, knew that one thankfully!

[mrmaggit]

-C- said:

Thats fine, I should have said hand basins for the bathroom. So, 32mm pipe, 35mm hole in the wall be ok?

Point taken ref kitchen sink, will worry about that next week! Got to play juggling the pipework around the units yet...

Not sure about becoming a builder, looks like far too much hard work

Shower is already done, knew that one thankfully!

Yes, 35mm should be fine. Don't make the hole too big, or you'll get all sorts of creepy crawlies coming in. Seal around the hole with some mastic once you're happy that you've finished, that'll stop the ants.

[mk1fan]

A 35mm hole is too small. Drill a 40mm hole. That will give you space you need to maintain the fall of the pipework without it binding on masonry. You're sealing round the pipe anyway so no insects are going to get in.