matt-me

That's all on my hit list, thanks

Hi Iceverge Thanks for the reply. Yes that's exactly what I will be having. I'm in contact now with a supplier who will be designing a scheme and will ask for their thoughts on this too. I'm thinking where I am proposing to run the ducts, the lowest triangle of space next to the eaves, I will be building a small skeiling wall anyway so can insulate them with rockwool or such like anyway. thanks again

Hi IanR. Thanks for this response, very helpful. I was wondering if we should use insulated ductwork for the extract and will take this on board. We are using EPS SIP panels and will try get the effective U value of these.

Hi there, first post on this forum and a relative newcomer to MVHR although I do have a basic understanding. I understand the importance of using insulated ductwork for the air intake and exhaust ducts to external air. I am building a single storey new build house, approx 120m2 ground floor area with a loft/mezzanine area over most of the ground floor out of 220mm SIPS panels, walls and roof. The MVHR unit will be sited in the loft/mezzanine space which is not heated as such but it is not a cold attic space. Question : is it recommended to use insulated ductwork in this space to run from the mvhr unit to the ceiling valves? I will be running it on the floor around the edge of the loft space, dropping into the posi joisted floor to the rooms below. I will be boxing it in for the most part so could insulated with rockwool or the like. Insulated ductwork adds a fair amount of cost, is it necessary? Is there a real risk of condensation in the ducts that i need to be concerned about? Ideally I would use insulated ductwork but semi rigid ductwork does save a fair bit of cost. Thanks in advance