How to fill a gap?

[Weebles]

Noticed a small problem tonight. Our larder door has been fitted as requested with a 20mm gap under it (20mm gap to allow for floor tiles). But it is an external door (the larder is outside the passive envelope) and the door hasn’t been sealed against the floor/threshold . It’s basically a gap of 20mm letting outside air in (our air test was done with a temporary door in place). 

 

Our floor tiler is coming on Friday. So this problem is a bit pressing. How shall we fill this gap? We are passive standard (but not getting certified). Any advice welcomed.

thank you.

 

 

[craig]

TP600, 30mm width with expansion of 13mm to 24mm will do the job. 

[Weebles]

Thanks @craig. I have messaged our fitter to see if he happens to have a short length lying around.

 

if he hasn’t, given our time frame, is there anything else we can do?

[PeterW]

Expanding foam... or pack it with sand and cement made from a damp mix of sand and rapid set. 

[craig]

Let me check if I have anything in the office, might only be 15mm 7/12 that I have but can be doubled up.

[scottishjohn]

just a suggestion

tile right under the door ?-

then a fix a   sealed threshold plate, if needed to tiles ?

[Weebles]

Put in some compriband in. Hopefully that will do the job. Thanks everyone.