I have a pair of wooden bifold doors to a conservatory. The head jamb is a
plain piece of wood - the doors do not close against anything, so they are
free to open inward or outward. There is a gap of about 3 to 7mm between the
top of the doors and the head jamb, which I need to insulate. Can anyone
recommend a product to do this please?
Most insulation strip products are designed to have the door close against
them, rather than to bridge a gap to the edge of the door.
I had reasonable results with a stick-on V-shaped paper or plastic strip,
which brushed the top of the doors, but the movement of the doors soon tore
it. Rubber D- or P-section strips sold in DIY stores might do it, but I fear
the friction would be too great (ie it would inhibit opening and closing the
doors), and the uneven gap is a problem; certainly it would not work if I
needed opposing strips on both surfaces to bridge the gap, as the doors need
to move in both directions and also longways as they fold.