Bifold door -drafty and condensation on internal surfaces

[jc212]

Hi again all,

 

I've had a search of the forum and couldn't find any similar threads so starting a new one.

 

Since start of this winter we've noticed drafts coming from our two sets of aluminium bifold doors. I originally thought it was a leaky door seal, however having applied some compressible stick on gasket this hasn't solved the issue.

 

About 2 nights ago noticed something strange which leads me to think this is another issue: condensation on the bottom aluminium profiles, extending up from the bottom about 1/3 way up the vertical profiles AND condensation on the floor in front of the doors.

 

I'm not expert on these doors and how they should be installed or sealed. Can anyone provide any advice. Doors were installed in 2020. Have contacted the original seller to see if they can support but not holding out a huge amount of hope.

 

Some photographs attached with a few observations:

 

Small very small gaps in sealant around outside edges of door frame to wall 

What appears to be cut out notches in the bottom of the sill 

Gaps on the gasket around the internal glazing panes 

Gap under outside ledge missing sealant 

[Mr Punter]

Aluminium is a good conductor so can easily act as a bridge between colder air outside and warmer air inside.  If any part extends from outside to inside without a good thermal break it will attract condensation.

 

To identify drafts you can go round the perimeter with a candle on a breezy day and see where it flickers.