My plan for a kitchen move/extension has a critical dependency on being able to tap into an internal boxed-in soil stack for drainage. Having drilled a hole in the boxing today I've thankfully been able to confirm with a borescope that there's sufficient means and room for a strap-on boss to be used..

Given the soil pipe appears to be Osma I figured I might as well go with one of their strap-on bosses[1] too as this isn't a connection I can afford to get wrong. Too this end, I've noted from Osma's design guide[2] that 'Solvent Cement Filler' should be used. Presumably this is given the nature of the joint not lending itself to 'standard' solvent cement?

However, I've since learnt that not only does hardly anywhere seem to sell this stuff (why not?) but also that it's around £20+ for a 200g tube!

So, I was wondering if there are any alternatives (e.g. other brands, standard cement, etc) or should I just swallow the cost on the basis that if that's what's required that's what's required! Can the cement filler be used on 'normal' connections too? I was also wondering why it's in a tube rather than a tub-with-brush which I assume is easier to use?

I have also considered whether instead of the strap-on boss if I could cut the pipe and insert a bossed pipe connector[3] in between but I'm not sure if there's any slack to push the upper pipe up to allow this to work.

Mathew


[1] http://co-uk.wavin.com/master/master...oduct_detail_I
[2] Pg 110 of http://content.wavin.com/WAXUK.NSF/pages/OSMA-Soil-Waste-Design-Inst-Guide-EN/$FILE/OSMA_Soil_Waste_Design_Inst_Guide_SW206.pdf
[2] http://co-uk.wavin.com/master/master...oduct_detail_I

"Mathew Newton" wrote in message
...
My plan for a kitchen move/extension has a critical dependency on being able
to tap into an internal boxed-in soil stack for drainage. Having drilled a
hole in the boxing today I've thankfully been able to confirm with a
borescope that there's sufficient means and room for a strap-on boss to be
used.

Given the soil pipe appears to be Osma I figured I might as well go with one
of their strap-on bosses[1] too as this isn't a connection I can afford to
get wrong. Too this end, I've noted from Osma's design guide[2] that
'Solvent Cement Filler' should be used. Presumably this is given the nature
of the joint not lending itself to 'standard' solvent cement?

However, I've since learnt that not only does hardly anywhere seem to sell
this stuff (why not?) but also that it's around £20+ for a 200g tube!

So, I was wondering if there are any alternatives (e.g. other brands,
standard cement, etc) or should I just swallow the cost on the basis that if
that's what's required that's what's required! Can the cement filler be used
on 'normal' connections too? I was also wondering why it's in a tube rather
than a tub-with-brush which I assume is easier to use?

I have also considered whether instead of the strap-on boss if I could cut
the pipe and insert a bossed pipe connector[3] in between but I'm not sure
if there's any slack to push the upper pipe up to allow this to work.

Mathew

Solvent cement is what is used on some waste pipe fittings. (As opposed to
push in/Oring and the compression type)
I have used this in the past with no trouble.

http://www.screwfix.com/p/floplast-s...nt-250ml/14295

On Sunday, 6 April 2014 09:42:15 UTC+1, harry wrote:

Solvent cement is what is used on some waste pipe fittings. (As opposed to
push in/Oring and the compression type)

Thanks Harry. I may have not been clear enough in my post; it is not the fact that solvent cement is required but rather that the gap-filling variety is specified by Osma for a strap boss whereas I've not seen the same by other manufacturers.

This could turn out to be a moot point as I'm actually leaning towards the use of a mechanical boss now:

http://www.mcalpineplumbing.com/land...tor-black.html

Not only does this remove the one-chance-is-all-youve-got aspect of solvent weld but it is also a fraction of the cost - only £10 compared to the £50 Osma setup (i.e. once degreaser and cement are factored in). Of course, I don't want to trade a financial cost with one of performance but I don't think I would be - particularly if I used a smear of silicone and a couple of jubilee straps to aid the integrity of the connection for peace of mind if nothing else.

It may well be prudent for me to have an access panel for this connection anyway and so I will be able to satisfy myself that it is sound and not leaking.

Mathew

In message ,
Mathew Newton writes
On Sunday, 6 April 2014 09:42:15 UTC+1, harry wrote:

Solvent cement is what is used on some waste pipe fittings. (As opposed to
push in/Oring and the compression type)

Thanks Harry. I may have not been clear enough in my post; it is not
the fact that solvent cement is required but rather that the
gap-filling variety is specified by Osma for a strap boss whereas I've
not seen the same by other manufacturers.

This could turn out to be a moot point as I'm actually leaning towards
the use of a mechanical boss now:

http://www.mcalpineplumbing.com/land...echanical-soil
-pipe-boss-connector/4-110mm-x-1-189-pipe-mechanical-soil-pipe-boss-conn
ector-black.html

Not only does this remove the one-chance-is-all-youve-got aspect of
solvent weld but it is also a fraction of the cost - only £10 compared
to the £50 Osma setup (i.e. once degreaser and cement are factored in).
Of course, I don't want to trade a financial cost with one of
performance but I don't think I would be - particularly if I used a
smear of silicone and a couple of jubilee straps to aid the integrity
of the connection for peace of mind if nothing else.

A little late replying, but I used one of those when connecting the
bathroom waste to my soil pipe.

Very quick and easy to install (well as long as you drill the right
sized hole.....) and seems to make a very secure connection
--
Chris French