40mm void at rear of sink base unit - seriously? WTF!

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Draughtsman

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I've been looking online at a new sink base unit that's listed as having a 40mm void to it's rear? Is it 40mm, or is it actually larger in order to accommodate the compression connections etc? My existing sink waste pipe is slightly over 40mm anyway, with the various connectors being significantly bigger. I don't see how a new sink base with a 40mm void will marry up without some invasive surgery to the unit.

Is the 40mm void measurement only a nominal size that actually means it will be large enough to accommodate compression connectors that accompany a 40mm waste pipe? If so what size would the void actually be?

I have an unused gas valve on another kitchen wall that is 75mm proud of the wall, I'd quite like a base unit in front of it without chewing too much (any) of the base unit off to fit in front of it.

Thanks,

Dain
 
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It will prob be 40mm

If it was me, I would take out the back. Fit some battens and trim down the back to fit inside the carcase.

Then fit the unit without a back, cut the back as required and fit the back in through the doors.

I make kitchens sometimes and always make loose backs. Trying to cut out holes to go around pipework on a fixed pope is a pain.

If you havent enough space put your battens on further forward to clear.

Cut the back in 2 pieces to go around pipework.
 
Notch7 said:
It will prob be 40mm

If it was me, I would take out the back. Fit some battens and trim down the back to fit inside the carcase.

Then fit the unit without a back, cut the back as required and fit the back in through the doors.

I make kitchens sometimes and always make loose backs. Trying to cut out holes to go around pipework on a fixed pope is a pain.

If you havent enough space put your battens on further forward to clear.

Cut the back in 2 pieces to go around pipework.
Click to expand...

I'm struggling to accept a base that has in no way been manufactured with ease of fitting being a priority. They can sling their hook if that's the case.
 
Dain1 said:
I'm struggling to accept a base that has in no way been manufactured with ease of fitting being a priority
Click to expand...

Units can't possibly be made to cover every eventuality. Alteration of units or pipework is perfectly normal when fitting kitchens.
 
Normally you would have your trap in the unit and the pipe straight out through the wall via a small hole. The 40mm is more likely for your smaller water pipes.

If your waste pipes run behind the units could you not alter them to run under the units instead?
 
agree with denso.

OP, are you asking about pipe runs,supply or waste, goin across the wall or pipe stubs projectin from the wall or both?
anyway, its a basic bit of joinery to mark and cut unit backs - usuly for pipe stub holes usin a hole saw.
it can be done simple and neatly.
first fixin determins positions of all an any stubs before any units evev show up in the kit.

sometimes base units have to be savaged to accomodate what youve got, not just the unit backs but the top stretchers and rails for sinks an work top bolts.
you do what you got to do an do it neatly.

OP presume your a DIY'er but what makes a joiner or kit fitter is bein able tomake it work.
 
I would also expect the measurements to be accurate. Could be worse - IKEA units have about 3mm and are a real pain in the arris to fit!
 
bobasd said:
agree with denso.

OP, are you asking about pipe runs,supply or waste, goin across the wall or pipe stubs projectin from the wall or both?
anyway, its a basic bit of joinery to mark and cut unit backs - usuly for pipe stub holes usin a hole saw.
it can be done simple and neatly.
first fixin determins positions of all an any stubs before any units evev show up in the kit.

sometimes base units have to be savaged to accomodate what youve got, not just the unit backs but the top stretchers and rails for sinks an work top bolts.
you do what you got to do an do it neatly.

OP presume your a DIY'er but what makes a joiner or kit fitter is bein able tomake it work.
Click to expand...

There's the rub indeed, a diyer finds that by the time the kitchen needs reworking, the fittings have all moved on and are unfamiliar.

It's the waste pipe that I'm trying to make easier.

I might just get a base that isn't so deep, so I start with the base not being up against the wall.
 
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Dain1 said:
I might just get a base that isn't so deep, so I start with the base not being up against the wall.
Click to expand...
Getting base units with a service's void has its advantages (y). Tbh altering the back panel or incorporating an access panel is a common job for installers,no need to be a wood butcher.

Any redundant pipework behind the base units can be removed :cautious:
 
Hot&Cold said:
Getting base units with a service's void has its advantages (y). Tbh altering the back panel or incorporating an access panel is a common job for installers,no need to be a wood butcher.

Any redundant pipework behind the base units can be removed :cautious:
Click to expand...

yes,but a 40mm void is good for not much when considering waste pipes.
 
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