I'm planning on putting a bathrobe/extra towel hook on the back of my bathroom door, but I'm pretty sure it's hollow wood. Can I just use the standard screws that come with the hook kit, or do I need something else?
Doors – What type of fastener should I use for a hollow wood door
doorshardware
Related Solutions
I think you've hit on the easiest solution. Putting in a layer of insulation board and then boarding over the top of that is the approach I'd take.
If you don't want to use the door then you can just put insulation right to the frame and board over that to hide the door completely. However, if you want to be able to use the door then you'd have to leave enough space at the edges so that the door could open without catching on the frame.
Insulation board is quite light so you'll probably be able to glue a frame to the door an inch or so in from the sides and then put the insulation in that. A piece of hardboard glued or tacked over the top will keep the board in place. This will mean that there is still some heat leakage around the sides but nowhere near as much as through the entire door.
Right Angle Hasp
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This type of right angle hasp would negate the need for guide pins, but would be inside the box.
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Flexible Hinge Hasp
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My first idea, before I thought of those hasps.
Barrel locks on the inside that are thrown into holes that are drilled into the sides (shown in green on the left).
And doll rods or guide pins to prevent side-to-side movement (shown in green on the right).
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Best Answer
You'll need hollow door fixings - something like these