Replacing dual pitch roof

[Notch7]

Thanks Notch, there’s no magic solution then!!

Back to the roof lanterns..

Are these essentially a conservatory roof - cold in winter & hot in the Summer?

How do these compare to a standard insulated pitched roof?

Thanks again

Obviously glass is less thermally efficient than a solid roof, so you are comparing 1.2 u value glass with 0.18 roof. However a lantern in the roof wont mean cold in winter and hot in summer. Orangeries are usable 12 months of the year, we build them for customers that use them as kitchen extensions, dining rooms, open plan living -they can lovely and warm in the winter. Heating method does have an impact, underfloor heating plus a couple of small rads is the most ideal solution. The underfloor heating is radiant at low level, so you get the heat where you want rather than hot air getting up high.

A decent size roof lantern adds a real architectural feature, it adds height and space to a room as well as bringing light into the room. The advantage of a lantern is the the glass is only 28mm thick -so internally you can have a floor to top of roof lantern height of say 3.3 metres, but still be well below 1st floor windows.

Dont think a flat roof with a lantern is only a poor option, it could give you the wow factorbyou are missing. We often have customers coming to us that have been through a process and planning with a designer but arent excited with a pretty standard single story extension.

Beware that at night a glass lantern does look black at night, one way to resolve that is to add led strip lighting all around the perimeter of the lantern reveals.

For ideas on extensions with lanterns search for orangeries from westbury garden rooms, david salisbury, prime oak. Look at interior shots -they will you an idea of the height and space you are missing in your extension.

 

[Sunshine12]

Obviously glass is less thermally efficient than a solid roof, so you are comparing 1.2 u value glass with 0.18 roof. However a lantern in the roof wont mean cold in winter and hot in summer. Orangeries are usable 12 months of the year, we build them for customers that use them as kitchen extensions, dining rooms, open plan living -they can lovely and warm in the winter. Heating method does have an impact, underfloor heating plus a couple of small rads is the most ideal solution. The underfloor heating is radiant at low level, so you get the heat where you want rather than hot air getting up high.

A decent size roof lantern adds a real architectural feature, it adds height and space to a room as well as bringing light into the room. The advantage of a lantern is the the glass is only 28mm thick -so internally you can have a floor to top of roof lantern height of say 3.3 metres, but still be well below 1st floor windows.

Dont think a flat roof with a lantern is only a poor option, it could give you the wow factorbyou are missing. We often have customers coming to us that have been through a process and planning with a designer but arent excited with a pretty standard single story extension.

Beware that at night a glass lantern does look black at night, one way to resolve that is to add led strip lighting all around the perimeter of the lantern reveals.

For ideas on extensions with lanterns search for orangeries from westbury garden rooms, david salisbury, prime oak. Look at interior shots -they will you an idea of the height and space you are missing in your extension.

Thanks for such a detailed response. I just presumed glass roof = too hot in Summer & too cold in Winter, like an old conservatory I had.

We already have UFH & cavity walls.

I hear you that the u value is better on a standard roof, but what does this mean in reality? Higher heating bills? Colder? Is the difference between .18 & 1.2 significant?

Thanks again