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MVHR with Flat Roof and Vaulted Ceilings


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This might be a question for @JSHarris as from memory he has a vaulted ceiling.

 

I'm struggling to get my head round MVHR duct routing where you've got a fully insulated vaulted ceiling, according to my drawings all I've got is a 22mm service void. I've got the same problem in two rooms which have flat roofs in a dormer. 

How do I route the ducts? I really dont want some sort of ugly boxing. Or do I have to put them into the wall instead?

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We have low walls in our vaulted rooms and so I just fitted the ducts and terminals in there, around 1.2m  above the floor.  In one bathroom I made a narrow ceiling so I could run the duct for it along there, and the duct for the adjacent bathroom, that comes out high on a dividing wall.

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I planned this at the start and created a service void in the ceiling to take the ducts and down lights but you need about 100mm.  MBC had to do battens on top of battens as the cross batten idea only gives 50mm at the cross overs

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If you are worried about loosing wall / roof U value then perhaps do as we have done in our design In our design. We are running in the wall and ceiling (also vaulted) in a couple of places and have designed to box in the duct with PU sheet, and fill around the ducts with the same frametherm fill as in the main void. This way we maintain the U value of the wall / ceiling as the PU is that much better than the frametherm. It will be fiddly on site but at least I can present the therm model to the passive house certifier if its a problem for them.

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I've been pondering this further this afternoon. I think I might alter our design slightly so that we have a flat section of ceiling at the top. We've got ooodles of height anyway and it will serve as a location for the MHRV duct and lighting. We've not got glazing up to the apex so thats not an issue. 

 

I'm not sure that the aesthetics of going all the way to the top are that important? 

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15 minutes ago, Barney12 said:

I've been pondering this further this afternoon. I think I might alter our design slightly so that we have a flat section of ceiling at the top. We've got ooodles of height anyway and it will serve as a location for the MHRV duct and lighting. We've not got glazing up to the apex so thats not an issue. 

 

I'm not sure that the aesthetics of going all the way to the top are that important? 

 

Snap !!! Doing exactly the same for lights and vents. 

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5 hours ago, Barney12 said:

[...]

How do I route the ducts? I really dont want some sort of ugly boxing. Or do I have to put them into the wall instead?

 

I solved the problem by routing the two ducts in a built in wardrobe -rather than the wall. Might that work for you too?

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30 minutes ago, recoveringacademic said:

 

I solved the problem by routing the two ducts in a built in wardrobe -rather than the wall. Might that work for you too?

 

 

Doh !!! You've just solved my other problem in a stroke...! I know how to get to the utility and study now...!

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30 minutes ago, dogman said:

Just be careful with the flat ceiling design. I did this but when i got the plans through there were gluelam beams in the way. Don,t want to drill 100mm holes through them

 

Tell me about it. My drawings have steel and glue-lam beams galore. Some of them entirely cut off two of the downstairs rooms for cabling or ducting. I've spent most of the day trying to work out routes. 

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1 hour ago, dogman said:

Just be careful with the flat ceiling design. I did this but when i got the plans through there were gluelam beams in the way. Don,t want to drill 100mm holes through them

If your glulams are 'low' enough you could create a flat ceiling either side of the beam and put ducting/wiring/ etc in there.

 

2 hours ago, recoveringacademic said:

 

I solved the problem by routing the two ducts in a built in wardrobe -rather than the wall. Might that work for you too?

But I like the wardobe option best in my case. I would have preferred them out of sight, but I;m sure they can be disguised.

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5 hours ago, Barney12 said:

I've been pondering this further this afternoon. I think I might alter our design slightly so that we have a flat section of ceiling at the top. We've got ooodles of height anyway and it will serve as a location for the MHRV duct and lighting. We've not got glazing up to the apex so thats not an issue. 

 

I'm not sure that the aesthetics of going all the way to the top are that important? 

This is what we are planning as well.

 

We are doing air to air heat pump as well so made sense to have space available for all these things.

 

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  • 3 weeks later...
13 minutes ago, recoveringacademic said:

 

Very tempted to do a @JSHarris and put a small extract in there (like his loo extractor)

 

Following that discussion about drying towels, I've stuck with the idea of a reasonably central extract in the utility above the drying rack. I've  also got the UVC and buffer tank in a plant cupboard off there so working out a way of extracting that useful heat into the MVHR too. 

 

 

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