Supporting pipes under floorboards + insulation

[Millsy 82]

Every now and then if there is enough room. Sometimes it's just easier to do that then lift all the boards.

 

[Last Plumber]

My advice:-
Crawl under the floor, use Copper and clip every 3 foot (roughly). Solder the joints, watch your face and eyes for molten solder and your ear holes and nasal passages for the odd spider who might be a tad nosy......... some will stare at you like this

and some will have no fear and ask who you are and what you want.

I had an apprentice with me a while back and I was surprised at how things have changed on the health and safety front (maybe they haven't but now they get drilled with it a lot longer than we did back in 1800 and frozen to death). Anyway, here is a bit of the type of advice he would have given!!

Mains power off, use battery lamps, observe all the panic and fear over confined spaces, fill a risk assessment form in, take a suitable fire extinguisher with you and mobile phone, tie a rope around your ankles and the hatch, make sure there is someone else in the building who knows you are under there etc etc, can't really remember much else he said because I was too busy crawling under the floor to get on with it.

Lagging:-
Foam and stand off clips is best in my opinion.

Who remembers Hair felt? that used to be popular didn't it? For those who do not, it was highly flammable and very dusty/hairy to work with. You could come out looking like Chewbacca after an hour or two under there wrapping pipes with that.

 

[ShaunCorbs]

Screw to the side of the floor joists ?

 

[kasser]

What did you do with the risk assessment form???
I understand how the strap band works with the insulation-wrapped pipe. But how do you clip a pipe with insulation around? You'll have to remove a small piece to allow for the pipe clip?
Someone needs to invent a long flexible support you can slide under the floorboard, screw to the joists at each end and then slide the pipes onto it. Job done. Basically doing the job of the plasterboard ceiling supporting the pipes that you run under the first floor.

 

[kasser]

Screw to the side of the floor joists ?

Only if the pipe runs parallel to it.

 

[ShaunCorbs]

Only if the pipe runs parallel to it.

Screw a piece of 2x2 if it’s perpendicular

 

[ShaunCorbs]

What did you do with the risk assessment form???
I understand how the strap band works with the insulation-wrapped pipe. But how do you clip a pipe with insulation around? You'll have to remove a small piece to allow for the pipe clip?
Someone needs to invent a long flexible support you can slide under the floorboard, screw to the joists at each end and then slide the pipes onto it. Job done. Basically doing the job of the plasterboard ceiling supporting the pipes that you run under the first floor.

You mean like this ?

Britclips® Rapid Sliding Wall Bracket

 

[kasser]

Screw a piece of 2x2 if it’s perpendicular

If it's plastic I'll have to do it every 300 mm. It seems there's no other way round screwing something every 300 mm whatever support method I choose.

 

[Last Plumber]

What did you do with the risk assessment form???

I can only tell you he didn't like it.

You'll manage OK with it, trust me I'm a Plumber.
The foam lagging will fit around the pipe from beneath and kind of envelope the clips, depending of course on the thickness of the foam. If it is too thick then as you already said, you'll need to nip a bit out.

 

[ShaunCorbs]

If it's plastic I'll have to do it every 300 mm. It seems there's no other way round screwing something every 300 mm whatever support method I choose.

Use mlcp then