Green Building Forum - Frost on roofs of new homes

Frost on roofs of new homes

tony — Fri, 09 Dec 2022 16:37:18 +0000

Here is an i-cloud link that has plenty enough in it for a mini dissertation!

https://share.icloud.com/photos/0e2LzadM_vBoJ-mAxu5rUx1yg

From left to right, first three pairs of semis; note the heavy frost lines above the party walls, this is nice to see as a lot get frost and snow melting here due to heat rising through the cavity. Here it probably has the required fire packing and this is insulating the tiles from the warmth in the loft allowing more frost to form and preventing it melting.

The first building with balconies has odd frost melt on the right hand high roof, presumably due to missing insulation?

The block to the right of the pylon in the background is interesting in that there is more frost round the perimeter of its roofs indicating better insulated and less well connected to the loft. I have my suspicions as to why.

The house on the far right I think is either unoccupied or unheated, looks too perfect.

For the OCD among us have a look at the fourth house from the left and notice how the frost has melted against the adjoining house. Lots of possible reasons, heat leaking up the gable wall, or is the outside skin being warmed by poor insulation in the wall of the fifth house? The sixth house looks to be warmer than the rest.

There is more, what do you see?

Frost on roofs of new homes

bhommels — Fri, 09 Dec 2022 17:11:41 +0000

Posted By: tony
For the OCD among us have a look at the fourth house from the left and notice how the frost has melted against the adjoining house. Lots of possible reasons, heat leaking up the gable wall, or is the outside skin being warmed by poor insulation in the wall of the fifth house?

Since the lower 'in between bits' of those symmetrical blocks towards the right have exactly the same feature, my guess would be that the radiative losses (causing the frosting on the roof to be so heavy in the first place) are less because it sits under the roof overhang, 'seeing' less of the cold night sky?

Lovely picture, thanks for posting. So much to see!

Frost on roofs of new homes

tony — Fri, 09 Dec 2022 22:38:08 +0000

ðŸ‘ thanks ðŸ™‚

Frost on roofs of new homes

tony — Sat, 10 Dec 2022 08:32:31 +0000

I agree about sitting under the roof overhang and not so exposed to the night sky but the result is too big for me

Interested if you can posy your pic please

Frost on roofs of new homes

tony — Sat, 10 Dec 2022 13:48:02 +0000

Anyone got a good explanation for this ?

https://share.icloud.com/photos/083Oi_XQ0dQItJExbbtWZa7gQ

Frost on roofs of new homes

Dominic Cooney — Sat, 10 Dec 2022 17:09:45 +0000

Posted By: tonyAnyone got a good explanation for this ?

heated bat loft?

cannabis farm?

Frost on roofs of new homes

owlman — Sat, 10 Dec 2022 20:01:10 +0000

Posted By: tonyAnyone got a good explanation for this ?

Loft conversion? with In-between rafter insulation only following roof pitch as far as the trimmer connecting both sides of the roof. Resulting in a poorly or un-insulated void above the upper room.

Frost on roofs of new homes

Peter_in_Hungary — Sat, 10 Dec 2022 21:00:33 +0000

Early morning photo with sun on top of roof only. Notice neighbour has similar melting although not so pronounced.

Frost on roofs of new homes

tony — Sat, 10 Dec 2022 22:02:09 +0000

No sun, very misty cloudy sky

Frost on roofs of new homes

tony — Sun, 11 Dec 2022 17:50:14 +0000

Wondering if it is due to a stairwell and or lift shaft?

Frost on roofs of new homes

Coverley — Fri, 16 Dec 2022 21:52:51 +0000

I'm impressed by the blueberry ripple frosting on the 4th from the left