How do you stop condensation on a patio roof?

[#1]

The moisture that drips from the underside of a steel patio roof can typically be attributed to condensation. Condensation occurs when warm, moisture-laden air comes into contact with a colder surface, prompting the air to release its moisture in the form of visible water droplets. 

Depending on the roof structure, a few different approaches can be employed to obstruct moisture-laden air from reaching the cold roof sheeting.

One effective strategy is the installation of insulation panels beneath your patio roof. This type of insulation is handy when there is a limited roof structure, as adhesive can be used to fix them to the underside of the sheeting. Additionally, integrating sarking can prevent moist air from direct contact with the cold roof surface. Sealing any potential gaps or openings is essential to prevent warm, humid air from encountering the cold sheeting. This approach ensures a controlled environment that significantly reduces the occurrence of condensation-related issues.

To complete the look, Aquacheck plasterboard can be then be used to encapsulate the insulation panels and provide a paintable and aesthetically pleasing roof sheeting for you alfresco area. - MitchellMc

[Melbournish]

Thanks for the great advice.

Would you leave the sections with transparent sheets without the sarking? Or would there be a different solution for these sections?

[EricL]

Hello @Melbournish 

Welcome to the Bunnings Workshop community. It's sensational to have you join us.

I'm afraid this will have to be a compromise as covering the transparent sections means that sunlight will no longer pass through and the area will be just a bit darker. But leaving that section uninsulated means that there is the possibility of condensation forming on the surface. I'm currently unaware of a cover that you can put on the transparent sheets that will provide the same type of insulation and still let the sunlight through.

Let me call on our experienced members @Dave-1 and @Nailbag for their recommendations.

If you have any other questions we can help with, please let us know.

Eric

[Dave-1]

Good Morning @Melbournish 

I would think that the clear plastic panels will have less condensation on them then the metal roofing, The plastic dosnt chill down so you dont get the reaction of the cold drawing the moisture from the air. I also think that the light through the plastic would be better then covering those sections over.

I would suggest to keep an eye on the plastic section and see how much and where you get condensation.

Dave

[pacificman]

I have Pergola instaled by Archgola .   1.6 m x 10 m.

Moisture  CONDENSATION  IS TO MUCH. .  fRAME IS METAL AND FROM

MIDDLE FRAME not JUST DRIPPING - IS LEAKING  AND MUST PUT ON FLOOR BUKET.

pLEASE,  if somebody advice me what to do. ?

some kind of i nsulation or ?

plese let me know ?    

I am in Napier

[JacobZ]

Hi @pacificman,

Welcome to the Bunnings Workshop community, it is fantastic to have you with us.

Is it possible to get some photos of your pergola so we can see specifically what you are working with? Let me know if you need a hand uploading images, I am happy to help if required.

Unfortunately, being in New Zealand, where foil faced insulation products are not available, it could be a bit tricky.

If the pergola was suitable to install a timber frame with some insulation batts and then plasterboard or fibre cement ceiling, this could help reduce the condensation on the bottom side, but we would need to see it to see if this is an option.

Considering the description that it is not just dripping, it is leaking, there could be a few issues at play, not just condensation.

I will wait to see what you've got, then assist further.

Jacob