New double glazed windows ... condensation inside

Woody39

Apodemus said:

Perhaps the older ones have insulated spacers or were filled with a different gas?

Surely the window company should know this as they supply and fit both makes of the product.  They are aware of the other product in the room.  All seems a mystery that's why they are finally taking one window out.  This time I will stand there and watch and check the gaps around the frame and brickwork.  Downstairs window there was a 30 mm gap one end and I saw it and they used a frame extender!!

Woody39

FreeBear said:

Some thick curtains drawn at night will also help.

Any idea what the room temperature is during the course of a day/night ?

Bedrooms have lined blackout thermal curtains.  Both rooms south facing.   Its 4.00 pm now and the house temperature is 21 c. heating comes on if it gets to cold automatically  House holds it heat quite well.  

Apodemus

Woody39 said:

Apodemus said:

Perhaps the older ones have insulated spacers or were filled with a different gas?

Surely the window company should know this as they supply and fit both makes of the product.  They are aware of the other product in the room.  All seems a mystery that's why they are finally taking one window out.  This time I will stand there and watch and check the gaps around the frame and brickwork.  Downstairs window there was a 30 mm gap one end and I saw it and they used a frame extender!!

I would imagine that each "make" can come in a wide variety of specifications and it may not be possible to tell from simply looking at the earlier installed windows what that exact specification was.

neilmcl

Woody39 said:

ashe said:

Condensation on the inside is nothing to do with the windows. If you have poor ventilation, look into getting a dehumidifier. 

I don't have poor ventilation.  So why am I getting it on one window and not the other.  Same room different products!

Are both windows on the same wall?

When is the condensation occurring, throughout the day or is just when you get up in the morning?

Woody39

neilmcl said:

Woody39 said:

ashe said:

Condensation on the inside is nothing to do with the windows. If you have poor ventilation, look into getting a dehumidifier. 

I don't have poor ventilation.  So why am I getting it on one window and not the other.  Same room different products!

Are both windows on the same wall?

When is the condensation occurring, throughout the day or is just when you get up in the morning?

Separate walls downstairs lounge and condensation in the morning

neilmcl

Woody39 said:

neilmcl said:

Woody39 said:

ashe said:

Condensation on the inside is nothing to do with the windows. If you have poor ventilation, look into getting a dehumidifier. 

I don't have poor ventilation.  So why am I getting it on one window and not the other.  Same room different products!

Are both windows on the same wall?

When is the condensation occurring, throughout the day or is just when you get up in the morning?

Separate walls downstairs lounge and condensation in the morning

One wall may well be cooler than the other due to it's aspect hence the condensation on that particular window. It may be nearer to the occupants of the lounge during the evening and therefore come into contact with more of the moist air than the other wall.  The point being unless the different windows were on the same wall it's difficult to say if one's performing better than the other, or if one is somehow faulty.

RelievedSheff

neilmcl said:

Woody39 said:

neilmcl said:

Woody39 said:

ashe said:

Condensation on the inside is nothing to do with the windows. If you have poor ventilation, look into getting a dehumidifier. 

I don't have poor ventilation.  So why am I getting it on one window and not the other.  Same room different products!

Are both windows on the same wall?

When is the condensation occurring, throughout the day or is just when you get up in the morning?

Separate walls downstairs lounge and condensation in the morning

One wall may well be cooler than the other due to it's aspect hence the condensation on that particular window. It may be nearer to the occupants of the lounge during the evening and therefore come into contact with more of the moist air than the other wall.  The point being unless the different windows were on the same wall it's difficult to say if one's performing better than the other, or if one is somehow faulty.

I fully agree with this. Our lounge and kitchen have two windows each on different elevations of the house. The windows were all made by the same company to the same specification and were all installed at the same time. Some mornings  we get condensation on the outside of the windows (not the inside) which can affect one window in each room but not the other.

Condensation on the inside of the windows points squarely at a lack of adequate ventilation despite what the OP would like to believe.

tonyh66

if the window had a 30mm gap and they used a frame extender, then they measured the window wrong. If this is the one they are taking out I would hope they have re measured and remade the window. Condensation on the inside of the window is definitely related to internal humidity and surface temperature of the glass.

rob7475

The condensation is the moisture in the air being drawn to the cold surface. Does the surface of the new windows feel much colder than the other windows if you check at night?

I doubt a badly fitted frame would cause the issue - if anything it would help I'd imagine. If it was badly fitted and let a draught through, it would help clear the condensation the same way a trickle vent would.

We always used to get condensation on our double glazing units during Autumn / winter mornings as we didn't like leaving the windows open overnight due to living next to a road. A couple of years ago, I fitted a PIV unit as it was much cheaper to run than a dehumidifier and we no longer get condensation apart from the coldest winter mornings where we may get a little in the bedrooms which soon clears.

RelievedSheff

rob7475 said:

The condensation is the moisture in the air being drawn to the cold surface. Does the surface of the new windows feel much colder than the other windows if you check at night?

I doubt a badly fitted frame would cause the issue - if anything it would help I'd imagine. If it was badly fitted and let a draught through, it would help clear the condensation the same way a trickle vent would.

We always used to get condensation on our double glazing units during Autumn / winter mornings as we didn't like leaving the windows open overnight due to living next to a road. A couple of years ago, I fitted a PIV unit as it was much cheaper to run than a dehumidifier and we no longer get condensation apart from the coldest winter mornings where we may get a little in the bedrooms which soon clears.

Which begs the question are the old windows not installed so great and are a bit drafty which is why they don't condense up?