Misting / Condensation Porch Double Doors

Anyone got a solution for this one?????????????

Bought double glazed PVC doors last year and got them fitted to my porch. They are double doors and open outwards. My original door is wooden and is approx 2 - 3 feet back from new doors.
My problem is that as the temp is getting cooler for the past few days I have constant misting / condensation on the OUTSIDE of the glass. There is a perfect 2inch border all around this misting. Buts its so bad that we cannot see out the doors.
Have been onto suppliers but its JUST outside their warrenty so they are not showing much interest. However, sales man did say that some new doors are being treated with & I quote "specially developed tempered glass layer that locks in heat and improves efficency of the door / window. The fact that its misting up is proof it works".
Anyone got any ideas on this one before I rip it out and hand it back in pieces.
Thanks guys.

Tired Paul said:

My problem is that as the temp is getting cooler for the past few days I have constant misting / condensation on the OUTSIDE of the glass.

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Thats not a problem, 90% of the country have to opposite problem, the misting is on the inside of the windows/doors
waht all this means is your windows are doing there job! the internal surface is remaining within the scope of the internal tempeture and as its colder outside the humidity in the air is condensing on the external surface. here's an experiment for you, leave your front door open a little and see if the new porch door fogs on the inside

have a read here where I mention about the the temperature differnce
http://www.askaboutmoney.com/showthread.php?t=162123

all I can suggest you do is look for a coating to be placed on the external glazing, like you get on the inside of a car window / Teflon type stuff (sorry I've no idea where you'd get it)

Thanks for the update. Thought for a while the guys installing the door might have acutally put the glass "inside out" so to speak because I've never come acorss this before. Will try your recommendation and see what happens.

Tired Paul said:

Thanks for the update. Thought for a while the guys installing the door might have acutally put the glass "inside out" so to speak because I've never come acorss this before. Will try your recommendation and see what happens.

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Ive only seen this is low energy/ passive/ well built homes

If I am reading the layout properly, it sounds like lack of ventilation between the two doors. Try leaving the external door slightly open. The new doors are better sealed whilst the old one was draughty. If so, then installing a vent in the porch should help.

A vent may nullify one of the main the benefits of the porch, which seems to be very efficient at retaining heat.

ONQ

[broken link removed]

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