Conservatory condensation

[Kevla1956]

Hi, I'm new here so forgive me if I duplicate a subject.
Like a lot of people, I want to use my conservatory more in the winter, so have installed radiators, which now keep it very warm. My next plan was to insulate the roof(it has polycarb roof panels) using Kingspan or Celotex and then cover that with Upvc cladding. Having cut the Kingspan to fit between the roof rafters and wedged them in prior to cladding, I have found several areas where condensation has formed on the underside of the polycarb roof sheet and dripped down into the conservatory.
Now I fully understand the nature of condensation and the need for good ventilation, but my question is this, if I use a contact adhesive to fix the kingspan sheet to the polycarb roof sheet, will this prevent warm air contacting with the cold roof sheet and condensing.
I'm still going to install a couple of vents in the dwarf wall to assist with ventilation.
Thanks in advance for any help or suggestions.

 

[foxhole]

If you eliminate the air space then no moist air can reach the under side .

 

[JP_]

also, kingspan will have vapour barrier, so if you cover edges with a foil insulation tape that should stop it - but it should be dry first, as once done there is nowhere for the condensed water to go.

 

[Kevla1956]

Thanks for replies so far, it's reassuring me that I'm thinking in the right direction.

 

[lostinthelight]

Are the rads an extension of the main house heating system?

 

[Kevla1956]

Yes, they were added recently.

 

[foxhole]

Yes, they were added recently.

I had isolation valves on mine just as they exited the house , always a chance of freezing in conservatory .

 

[Kevla1956]

My heating engineer made sure that the isolation taps were inside in a warm area, so hopefully avoided the freezing up problem.

 

[chris1982]

I had isolation valves on mine just as they exited the house , always a chance of freezing in conservatory .

But unless you drain the pipework, you might still get a split pipe, no?

 

[foxhole]

But unless you drain the pipework, you might still get a split pipe, no?

Its not to prevent damage just reduce and make repair easier.

 

[lostinthelight]

Our nieghbour had a company around for a price to extend the heating system and insulate the roof and said the changes would come under building reg as it would no longer be classed as a conservatory

 

[JohnD]

Kingspan or Celotex and then cover that with Upvc cladding.

very flammable materials that also emit toxic gas in a fire.

Since Grenfell, you might like to consider mineral wool insulation and plasterboard. Neither will burn.