Can pipes to combi be chased into a wall.

[cascas]

Just planning a kitchen. Usually a combi fitted into a kitchen has the pipes from the bottom put through the worktop and boxed in. The layout I am working with is a bit of a pain, and I have little choice but to put the dishwasher below planned location for the boiler. At the moment neither can be moved.

As the dishwasher has little (i.e no) clearance behind I cannot plan it to allow the pipes to pass from the boiler to the left hand side of the dishwasher/sink etc. Is it acceptable to chase these pipes (inc gas) into the wall between the boiler down to behind this dishwasher and out to one side.

 

[SafeGasInstall]

everything is possible is just going to cost you more

 

[clarky101]

Threaded Black iron for the gas....

 

[diamondgas]

You can chase ... A thought though, could you channel them in a duct so they're accessible?

 

[cascas]

Threaded Black iron for the gas....

Is copper not used for buried pipes?

 

[clarky101]

Not for Gas...

 

[P4ULT]

i always thought it was ok as long as it was protected i.e plastic coated.

 

[cascas]

You can chase ... A thought though, could you channel them in a duct so they're accessible?

Was just thinking about if I could do this, not sure yet. I will chase the wall / allow space for a duct, so that the installer can just run the pipe in the space.

 

[clarky101]

Always used BI on chased work myself, surely you can still puncture plastic coated or similar........
Can the boiler be re-positioned anywhere else ....

 

[Mike Jackson]

Black iron is a good idea but not a legal requirement. B.S. 6891 doesn't even mention protection from corrosion for gas pipes chased into walls.

 

[Roger Welton]

I also though black iron of coated copper but with a steel plate in front to protect was a requirement if gas pipe is set in a wall (sure it is in viper book somewhere) to protect from mechanical damage.

 

[SafeGasInstall]

if duct void space for pipes must be vented

 

[Mike Jackson]

Metallic protection is specified for timber framed not pipes chased in masonry. Check BS 6891 section 8.9 ans figure 6.

 

[Mike Jackson]

if duct void space for pipes must be vented

Only if cross sectional area is greater than 0.01 square metres.

 

[diamondgas]

Was just thinking about if I could do this, not sure yet. I will chase the wall / allow space for a duct, so that the installer can just run the pipe in the space.

I've seen a few purpose made channels in walls with just a screwed on boarding flush with the wall surface for access. It depends on what the wall construction is; cavity, timber framed....etc Leave it open top and bottom if you're concerned about gas regs, and if cavity wall, make sure you don't allow any gaps in the cement that can communicate with the cavity! AND also consider where the filling loop is going to be fitted if you happen to have an appliance that doesn't have an integral one

 

[AWheating]

gas pipework chased into the plaster work is fine. Copper is fine if protected from corrosion. It only needs a steel plate (1mm thick) fitted over it if its chased into the brickwork its full depth. The gas pipe will need to be incased in either sand and cement or dabb. There are drawings in the corgi and viper books showing how its done.

Personally i would try your best to avoid it as its alot of work and if you want to alter anything later it will be a pain. Can you get a stand off kit for the boiler and drop down from above?

remember to make sure if you go into the brick/block work you keep the chase depth to the building regs to avoid weakening the wall.

if its a newly dabbed wall you could consider cutting out the plasterboard, sealing the sides and running the pipework clipped to the brickwork and the above the worktop create a removable box under the boiler which you could tile over to match the wall, just remember to seal both side of the timber box before tiling to avoid it bowing.

 

[stevetheplumber]

can the combi pipework go up?you can get stand of brackets to allow pipework to rise behind the boiler