Cold windows condensation (1)

[Mark2805]

Hi can anyone help i have new windows fitted July, all silicon went yellow , feels cold at windows and doors and condensation appears inside when temp drops out side creating damp and mould growing , fitter told me I need to buy dehumidifier which I have still same I also have a thermo scanner room temperature sits at 20 and when next to bottom of window its 9 degrees ,my credit card took the money back from company , they are due to try sort them but I still don't even have a receipt from previous payment ,can I get new installer to remove their windows and tell them to jeep them

 

[^woody^]

DG windows are not immune to condensation - that is caused by you, and your use of heating and ventilation.

Do they have trickle vents? Are you using them?

Fading mastic is a quality issue

 

[Mark2805]

Yes even when trickle vents open condensation still comes , I have had no issues before and lived in same house 18 years and 2 sets of windows later , my neighbours no condensation, also feels lot colder in house and when I aim the thermometer at window bottom showing huge difference ,thanks for reply

 

[^woody^]

Do you have the FENSA/CERTASS certificate? If you do and you don't think the frames or glazing are up to standard, you could ask for an inspection.

 

[Mark2805]

No they have given me nothing nit sure if they are members of this scheme I will look into thus thanks

 

[Mark2805]

Just checked not a member of these schemes

 

[ronniecabers]

This is becoming more of an issue ...

As woody says , new windows WILL NOT solve condensation. Condensation is caused by water vapour from living ...EG cooking , boiling the kettle, baths ...breathing. Trickle vents do not solve condensation either. Condensation can only be dealt with by addressing what is causing the water vapour ... or by ' purge ' ventilation EG opening a window ( not ideal in winter i know but the best method ) , or by extractor fans or by expensive recirculation methods . You will get a differing temp at the new windows as they are not as thick as your walls and you also get ' convection ' around windows due to your heating ( which leads to people thinking there is a draft )but you differences do seem a little extreme. My guess, and i stress guess, as i have not seen the installation is possibly a lack of capping cavities , or not using expanding foam to fill any gaps around the window . I removed some windows years ago from a house that the window was 20mm smaller than the opening and the gap had been covered up by plastic trims inside and out ...but nothing between the trims, just air, the customer did say the room always appeared cold.

I'm not going to go into the pitfalls of not using a Fensa/Certass registered installer, all i will say is registered installers go through inspections , on their fitting and surveying quality...

 

[Mark2805]

Thanks for reply just strange I have lived here mist my life and never once had issues with condensation , I also got a meter that tells me humidity below 40 so again think that's well in normal range my dehumidifier been running for 2 weeks now and not got any water so that makes me think cold air meeting hot , also my windows only do this when below certain temp if I had moisture in air surely that would be every day I get this or am I wrong they are going to seal windows again if that fails I was going to ask them to remove a window sill inside to check installation , thanks for help

 

[ronniecabers]

From what you are saying it does sound more like a fitting issue to me. Is it every window they have fitted? Is it just condensation around the edges of the glass or are the windows ' running' with water? Was it old single glazed windows removed?

 

[Mark2805]

Mainly just on 2 rooms that face north ,I had double glazing before these ,guy said because we sleep in room all night but this is building up before we go to bed on cold nights ,thanks for replies