Tri-folding doors?

[scrummyyummy]

I have a gap of 5ft 1 (154cm) wide and 6ft 8 (203cm) height leading from the kitchen to the conservatory. It's SO cold in the winter so I was thinking if it's possible to have tri-folding internal doors which fold up on each other so I can close off the conservatory? It's quite narrow for 3 folding doors but I don't have the room to have opening doors as it would block the dining table. I basically want to find out if I could buy 3 narrow folding doors or if carpenters could make them easily?

[buildersmate]

Technically possible, but tri-fold doors are going to be for internal use, incorporating single glazing (if there is glazing), and hence the improvement in thermal performance will be marginal for the effort and money expended.

Without implying any criticism, how is it that the original external doors from the kitchen to the outside were removed (when the conservatory was built)? This should not have been allowed to happen since it is virtually impossible to meet Buildings Regulations for thermal performance in the house by taking such doors out (patio doors or whatever).

The correct (thermal) way to solve this is to refit a proper external-quality patio sliding door or similar, incorporating at least double glazing units to a good spec., but that will eliminate one half of your current doorway aperture.

[scrummyyummy]

Thanks for your input, Builder. I'm not sure what happened with the original door as it wasn't there when we moved in. I'll look into having some sort of patio door to put in.

[The Builder]

You would need a joiner rather than a regular carpenter, Scrummy. I had something similar made recently for a barn conversion.
Just as BM has said, they would have to be of external specification, if only for minimising heat losses.
It would be worth asking a joiner to quote. I doubt if you could get them off the shelf because of the odd size.
If you're considering uPVC, than there are plenty of places that would make them up to your size.

[scrummyyummy]

Thanks for that, Builder (2 Builders coming to my aid! Lovely!). So joiners can make doors which aren't standard sizes? I would prefer to have folding doors so they can just fold flush against the frame in the summer. I have been looking on websites for doors but the sizes aren't quite what I need. What sort of 'external specification' should I look for? Eg, how thick should the door be?

[The Builder]

Joiners mostly make to a size that's given to them by the customer. Don't worry about the spec. They'll know just what's needed.
Usually 44mm thick. The main consideration is to have enough rebate in the doors to take a double glazed unit. 24mm is a favoured thickness for DG units now.
You won't need a full threshold door frame since the doors are internal.
What you will need is a less obtrusive threshold of some kind to take the draught strip. Also, ask for draught stripping on sides and top. They'll machine the doors to receive the strips, so there'll be no need for that "stick-on" stuff.
You might also like to discuss draught seals on all the "meeting" edges of the doors (where the leaves touch each other.
A combination of minimal heat loss (DG units) and draught seals is what you're looking for.

[scrummyyummy]

Builder: thank you so much for your expert advice! I really appreciate your wonderful knowledge!

[nikosmalios]

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