Warm roof insulation - Kingspan Thermaroof TR27

[Big G]

Hi, does anyone have any experience with Thermaroof TR27? my warm roof drawings don't show a top layer of 18mm OSB, only shows OSB at deck level below the insulation. I'm confused, every video i've watched had insulation sandwiched between layers of OSB. Does this Kingspan product have a rigid top layer of some kind?

 

thanks

G

[goodbyegti]

That's correct. You can bond a single ply membrane directly to it. The top layer isn't particularly tough, it's very thin, perhaps 1mm? 

[RobLe]

I found exactly the same.  That is, anecdotal use involved an osb sandwich, while the actual bba certification calls for the waterproof layer to be directly on top of tr27.

I think osb under the tr27 is in a danger zone, should anything go wrong with the vapour barrier below or the waterproof layer above, and will rot.  However practically not doing that makes for a springy roof surface that can easily get damaged by foot traffic.  
I went with osb under epdm, put lots of solar panels on it, walk about on it, I’m happy with it.

I especially liked the osb tg4 interlocking as it made for a nice flat surface which I might not have got with tr27 directly as I was doing a refurb, and not starting with a perfectly flat surface.  
The only thing I’d do differently is choose a lighter colour membrane, what little of the epdm is visible around the PV gets hot in the summer sun.

[G and J]

1 hour ago, Big G said:

Hi, does anyone have any experience with Thermaroof TR27? my warm roof drawings don't show a top layer of 18mm OSB, only shows OSB at deck level below the insulation. I'm confused, every video i've watched had insulation sandwiched between layers of OSB. Does this Kingspan product have a rigid top layer of some kind?

 

thanks

G

We are in the middle of finalising our flat roof design. The architect suggested a cold roof with less insulation than I would like and less than ideal allowance for services and airtightness (if that’s a word). 
 

@Big GI would be grateful to have sight of your warm roof design. 

[G and J]

8 minutes ago, RobLe said:

The only thing I’d do differently is choose a lighter colour membrane, what little of the epdm is visible around the PV gets hot in the summer sun.

Golly, that’s a very good point. 

[Big G]

@G and J have a look, i'm not too impressed with the drawings, don't think i'll be using the TR27.

[G and J]

1 hour ago, Big G said:

@G and J have a look, i'm not too impressed with the drawings, don't think i'll be using the TR27.

Thank you.  The drawing is fine from my point of view - it helps me confirm my understanding of what we are needing.  We’ve got two flat(ish) roofs to sort out, one on the house with a parapet and one on the man cave down the garden, so I need all the help I can get.