To cross pipes and ducts with a partition wall

[detlof]

I am about to build a wall (probably a double studded 2x2 layer gypsum). At one point it will be crossed by hot and cold water pipes, hotwater circulation pipes, hotwater radiator pipes and vent ducts. Total four pipes and two ducts running alongside each other, approx 30 cm (1´) down from the ceiling, each one covered with mineral fibre insulation and plastic.

What are good ways to do this? Should I strip the pipes where they cross the wall and use acoustical caulk? How do I avoid the cold water pipe from condensing inside the partition?

I am thankful for any comments or links to relevant info on this.

regards
Jonas

[Bob]

Condensation of cold water pipe: wrap the pipe in foam pipe insulation (those 3' or longer tubes with a slit up the length)
http://www.randgsupply.com/Warehouse/Pl ... cwater.htm (near the bottom left)
Best case it won't condense at all. Worst case the foam will act like an evestrough and run the water out both sides of the wall.

Most pipes can be enclosed inside walls, or build a box or soffet around them.

Your hotwater radiator pipes (assuming you have radiators in your room) and vents require more details.

[detlof]

Condensation of cold water pipe: wrap the pipe in foam pipe insulation (those 3' or longer tubes with a slit up the length)

Doesn´t that compromise the wall. i get the feeling that sound will just pour through the foam. Is it better to use foam than mineral, wich covers the pipes now.

Most pipes can be enclosed inside walls, or build a box or soffet around them

Always wanted to ask: what is a soffet?

Your hotwater radiator pipes (assuming you have radiators in your room) and vents require more details.

Yes, two radiators in the room. Those pipes are quite silent though. The vents are problematic.....They´re leading air from the fan (outside the room) to an outlet on my right wall. Maybe I´ll just box them....

Jonas

[Bob]

Yes sound will go right through the foam. It was meant as a solution to condensation. If you've already got them insulated and you think that insulation is also water tight, then that's good enough.

Sound will also go right through the pipes. It'll go through the pipes less if they are mechanically decoupled in some way. But the best choice is to keep the sound away from the pipes by building a little bitty wall around them.

Outside a 'soffit' is the under board of your roof, as shown in
http://www.fascias.com/en-gb/pg_41.html

But inside, which is what I meant, was a 'soffit' that is just a long box that that is near the ceiling and runs the length of the wall. Most often it encloses ductwork.

Page 15 of this shows duct vents in a soffit that has the main ducts in it.
http://www.cinemasource.com/articles/four_ht.pdf

This shows how to make a very thin soffit, in this case just to hold some wire.
http://www.diynet.com/diy/hi_family_roo ... 64,00.html

Here's how to build a box beam, which if you run things inside of it, is sort of like a little soffit.
http://www.diynet.com/diy/hi_kitchens/a ... 01,00.html

'Soffit' can also be something unusual that just looks like a soffit.
http://www.acousticsciences.com/products.htm

[Scott R. Foster]

How cold is that water... is this a refrigeration pipe, or just a potable water pipe?