letterbox insulation

Hi
Help ! Our house is suffering from a very bad draught through the letterbox.
The letterbox is a vertical slot with a flap that opens inwards and hinges on the (short) top edge. There is a cross-slat in the door behind the letterbox that obscures the top edge of the slot. It is therefore impossible to fit the standard brush type insulating frame.
Instead, I woud like to try to fit an additional external flap that completely covers the slot that lifts outwards - but where could I get something like this from. I can't find anything like this anywhere.
Merry Xmas and many, many thanks to anyone that can help.
thanks Neil
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An external flap will be a Rube Goldberg affair - not necessarily a bad thing if it works, but it would look like poop. How about a magnetic flap on the inside? That's assuming it's a steel slot. If not, maybe using some polyurethane or silicone caulk to make your own gasket and/or swapping out the spring (assuming that it's spring- loaded and not gravity) for a stronger one.
R
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Thanks for the ideas. It is a steel slot. Any kind of caulking or filling just stops the flap from returning - as it isn't spring loaded (it returns under gravity only).
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on 12/17/2007 1:01 PM neilsolent said the following:

slot with a lift door on the top to get the mail out?
--

Bill
In Hamptonburgh, NY
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Good idea, and it would work well. However I am not very handy with stuff like that. Think this may be the only option.
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If it really bothers you, remove it, mount an outside mail box and repair the door opening with decorative trim. I think you will find that a replacement weather proof door mounted box to be a very pricey situation by comparison. Good luck.
Joe
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I tried several things to get ours to seal better and finally filled it in, caulked it shut and mounted a regular mail box outside. Probably not much more fuel efficient since now we have to open the door to get the mail, letting in a lot more cold air all at once rather than the trickle full time!

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