Simple pipe run question

[SparrowHawk99]

Question is when running plastic pipes parallel with joists how often are struts required to stop the pipe from sagging? This is a victorian house so there are no noggins between joists just clear runs from one side of the house to the other. Many thanks

 

[Armo74]

15mm= every 300mm
22mm= every 500mm horizontally.

 

[Agile]

The pipe can be clipped with pipe clips or just laid on angled nails for a cheap job!

 

[Terry lambert]

Installed correctly you would have supports, maybe with some noggins set below board level between the joists and clips

I have yet to see this done anywhere and I see a lot of jobs.


Pipes are normally just pushed through and sagging

 

[SparrowHawk99]

The reason I ask is because if I'm to install correctly this requires lifting every single board the pipe passes under. Whereas if I don't support the pipe I can just feed the pipe through, put an elbow on and start with the next run. In this situation I'm unable to clip as two pipes run side by side (2 for central heating) and another two pipes run side by side (one supplying cold water and another supplying hot water) So I decided to come right out almost half way between the joists, so that they must be supported with struts and cannot be clipped to the joists. I'm making a lot of work for myself

 

[Terry lambert]

You would clip the pipes to the noggins that you would put in, say with 2x2

Lift every 5th board, install a noggin, put clips on noggin ( allow for this depth) run pipes feeding up over the noggins and into clips

Tadah

The reason no one does this, is because it is because it's like a bad case of haemorrhoids.

So just push the pipes through, test them and put the floor back down like everybody else does

Put a push fit cap on the end of each pipe when you push them through to stop debri going in the pipe and then later your system/boiler

 

[Agile]

In my view if you have a wooden noggin then you dont need clips because the foam pipe insulation will space them apart and off the wood.

Often as a cheap job I string wire from nails into each joist and just lay the insulated pipes over the wire.

Most I see though just lay the bare pipes over the soil. I think that encourages rats to eat plastic pipes and dampness to corrode copper pipes.

 

[SparrowHawk99]

Ok thanks then guys.

So one last question is where do I buy push fit caps that don't stop me feeding the pipe through the joists. There's only a 1mm gap to play with so if I use a stop end I won't get the pipe through the joist. Can anyone link me a picture of these push fit caps?

Also to let you know I'm using this pipe:

http://www.toolstation.com/shop/Plu...+PB+Barrier+Pipe+15mm+x+50m/d20/sd3307/p11922

with standard JG elbows and straights

http://www.toolstation.com/shop/Plumbing/John Guest Speedfit/Elbow Connector/d20/sd3307/p23989

And for the inserts I am using JG superseals

http://www.toolstation.com/shop/Plumbing/John Guest Speedfit/Superseal Pipe Insert/d20/sd3307/p68773

but for the connections to radiators which will be copper above floor, I am using these inserts for only plastic to copper

http://www.screwfix.com/p/jg-speedfit-tsm15np-inserts-15mm-pack-of-10/64318?_requestid=236020


Have I got the right stuff?

 

[Terry lambert]

1mm gap?

Do you mean your installing the pipes across the joists, if so you you would normally lift that board and notch it.

If your running between the joists, then as above.

 

[SparrowHawk99]

1mm gap?

Do you mean your installing the pipes across the joists, if so you you would normally lift that board and notch it.

If your running between the joists, then as above.

Through joists with a 16mm flat drill piece.

A stop end like this:

http://www.screwfix.com/p/stop-end-15mm-pack-of-2/65021

Is to large in diameter

I'll probably go with these

http://www.screwfix.com/p/solder-ring-stop-ends-15mm-pack-of-2/39404

Silly question I know but it's one of those trick of the trade type things isn't it

 

[Terry lambert]

Just put a bit of tape over the end of the pipe.

I would go for a little bigger than 16 mm though

Why not lift the board and notch the joists, then push pull the pipes when your running with the joists.