How well does 50mm channel plastic insulate?

[Punderdatrullen]

Hello.
I am in the process of building an "attefallsutbyggnad" on my house. It will have a 50mm polycarbonate roof. The walls are insulated and I bought used double-glazed windows. The extension is on pillars, and there will be 170mm of insulation in the floor.

I will need to remove the old patio door as its position makes it impossible to furnish the space practically.

The question now is whether I need to install a glass sliding door or if the sunroom will be so well insulated that a door won't be necessary?
What do you think?

 

[fremax]

Unfortunately, not enough. You will experience a significant cold downdraft from the roof, everything will work but it will require unnecessarily much heat to compensate for the cold downdraft. Your channel plastic roof has about 0.8 in u-value, while a roof should maintain about =0.2-0.4.

Best regards, fremax

 

[Punderdatrullen]

Not enough, unfortunately. You will get a large downdraft from the roof, everything is possible but it will require unnecessarily much heat to compensate for the downdraft. Your polycarbonate roof has about 0.8 in U-value, while a roof should maintain about = 0.2-0.4.

Best regards, fremax

Okay. Thanks for the answer.

Then I'll take a look at a good sliding door. A glazed one. Do you think a proper one with insulated glass is necessary, or is a simple interior sliding glass door enough?

 

[fremax]

Feel free to insulate, it's all about how much energy you want to consume

Best regards, fremax

 

[Punderdatrullen]

Insulated preferably, it all depends on how much energy you want to consume

Best regards, fremax

Thanks for the help!

Then I'll go and look for an acceptably nice patio door that allows me to build in the whole package.

Should one be able to maintain at least 10 degrees in the sunroom during the coldest winter?
I was thinking of having porcelain flower growing and also fig trees and some other bits and pieces.

 

[fremax]

Absolutely, it should work out perfectly! Good luck and post pictures of the construction!

Best regards, fremax

 

[Punderdatrullen]

Thank you! I will try to remember to upload pictures

 

[Punderdatrullen]

Absolutely, it should go perfectly! Good luck and post pictures of the build!

Kind regards, fremax

Bonus question.
I am now planning to make a window section. Two meters wide. Do I need a facade section or is insulated glass enough for a winter patio?

 

[fremax]

You can build your own frame with studs/wooden strips and sealing tape, just make sure everything is tight and insulated so you don't need to buy a facade section. If you're not 100% set on the dimensions, keep an eye on Blocket for mismeasured windows or similar items. You can usually get them for 60-80% off the new price.

Best regards, fremax

 

[fremax]

Where in the country are you?

 

[Punderdatrullen]

You can build your own frame with studs/wood strips and sealing tape, just make sure everything is tight and insulated so you don't have to buy a facade section. If you're not 100% precise with the measurements, keep an eye on Blocket for mismeasured windows or similar. Usually, you can get them for 60-80% of the new price.

Best regards, fremax

Ah! Great idea!

I'm located between Jönköping and Falköping


Edit. What was so good about 2 meters is that at Skånska Byggvaror you can get a winter terrace sliding door with 3 panels = larger opening

 

[fremax]

What temperature are you planning to maintain in the sunroom during the winter?

Best regards, fremax

 

[Punderdatrullen]

What temperature are you planning to maintain in the conservatory during the winter?

Best regards, fremax

In the conservatory, I hope to maintain 10-15 degrees. Just enough for porcelain flowers and fig trees to survive. If it stays between 15-20, that would be even better.

 

[para]

What heat source are you planning to have in the conservatory?

 

[Punderdatrullen]

What heat source are you planning to have in the conservatory?

It will be waterborne radiators via electric heater