Back boiler builders opening (Gas)

[OwainDIYer]

The Baxi 401 back boiler builder's opening does not comply with regulations.

It needs a sealing plate fixed around the (copex? crinkly metal) flue pipe - can't find these online, any help with a piccy or a price.

It needs gaps round the water/gas pipes cemented - do the pipes need sleeving before cementing and if so with what.

Do the pipes inside the opening need taped and if so with what.

I don't want the Gas Safe Registered Engineer, who sadly doesn't do the work himself, to come back and fail anything that's been done by a builder.

It will also help get a proper quote if I understand what's to be done.

 

[45yearsagasman]

The pipes exiting the opening can just be sealed with mortar,the only pipe that requires covering with tape is the gas supply and the part you need is called a 5" flue clamping plate obtainable from Plumbers merchants.To do all this work you need to get a qualified RGI as the fire front needs removing and reconnecting.Rough guess is about £100 all in.

 

[namsag]

No need for a sealing plate rockwool will do it and is perfectly acceptable

 

[45yearsagasman]

Rockwool on its own is ok but doesn't it need supporting to stop it falling? Non supported rockwool NCS isn't it? or has my memory gone? Doing all I suggested would leave no non compliance issues.

 

[namsag]

Yep memory gone Rockwool is not NCS nothing at all is NCS

 

[45yearsagasman]

I stand corrected When did that change as It was always recorded as NCS if no anulus plate fitted?

 

[namsag]

It always been NCS if anulus not sealed but when it is sealed it does not have to be with a plate as some would be impossible to do with a plate.
Rockwool been acceptable for at least 20 years and probably a lot longer

 

[45yearsagasman]

Ok,just that where I worked ,rockwool and no supporting plate had to be recorded as NCS.I even new of some guys being pulled up by missing that.Cheers anyway

 

[kirkgas]

The pipes exiting the opening can just be sealed with mortar,the only pipe that requires covering with tape is the gas supply and the part you need is called a 5" flue clamping plate obtainable from Plumbers merchants.To do all this work you need to get a qualified RGI as the fire front needs removing and reconnecting.Rough guess is about £100 all in.

the copper water pipes will corrode if in contact with cement, so best to cover them all

 

[45yearsagasman]

Kirkgas, yes ok but thats not a requirement of the gas regs which was the original query.

 

[OwainDIYer]

As I understand it, two NCS's make an At Risk.

As ventilation is NCS, everything else has to be absolutely compliant.

 

[picasso]

As I understand it, two NCS's make an At Risk.

Its only if the 2 NCS are on an open flue that it becomes at risk, other NCS dont count.

 

[45yearsagasman]

As I understand it, two NCS's make an At Risk.

As ventilation is NCS, everything else has to be absolutely compliant.[
/quote]
Thats the 1st time you mentioned that the vent is NCS?

 

[OwainDIYer]

I can get away with the ventilation - it's more than 90% - but the builders opening needs sorted. Then I can have the heating on again.

 

[Paul Barker]

Agree with namsag but it has to be proper fire retardant rockwool not the cheap stuff from B and Q, or it is ncs.