Garald Posted December 7, 2022 Share Posted December 7, 2022 There is an internal door that I want to insulate (thermally, and possibly phonically as well), as it leads to a stairwell that we cannot insulate. (It's a very tight stairwell going to the attic.) However, the space under that stair is also the planned location for the cat toilet, and I do not know whether we will succeed in herding the cat into the attic every night. Are (a) insulating the door (b) carving out a cat-door in the bottom part of the door compatible goals? Link to comment Share on other sites More sharing options...
JohnMo Posted December 7, 2022 Share Posted December 7, 2022 Seems you may have a huge gap in the insulation called a cat flap. Don't sound that compatible. Link to comment Share on other sites More sharing options...
Jilly Posted December 7, 2022 Share Posted December 7, 2022 How about putting a thick curtain up to help? Most cats would figure it out. Link to comment Share on other sites More sharing options...
Nick Thomas Posted December 7, 2022 Share Posted December 7, 2022 https://www.thepetflap.com/passivhaus-pet-door/ 1 Link to comment Share on other sites More sharing options...
Radian Posted December 7, 2022 Share Posted December 7, 2022 42 minutes ago, Nick Thomas said: https://www.thepetflap.com/passivhaus-pet-door/ "3.979 W/(m²K) is a very good result for a pet door and far outperforms all standard catflaps. A typical catflap with an acrylic flap of 2-3mm thickness has a U-value in the order of 6/6.2 W/(m²K). The lower the figure the better." Ubakus gives a 3mm sheet of polycarbonate a U-value of 4.444 W/(m²K) so if a regular kitty flap was 0.2m square (0.04m2) that would be a 3.5W loss with delta T of 20oC. The ones with a magnetic closer are pretty good at being draft free. Link to comment Share on other sites More sharing options...
Adrian Walker Posted December 7, 2022 Share Posted December 7, 2022 1 hour ago, Nick Thomas said: https://www.thepetflap.com/passivhaus-pet-door/ I know someone that installed it on their new build and the cat won't use it at all. Just waits by the door! Link to comment Share on other sites More sharing options...
Garald Posted December 7, 2022 Author Share Posted December 7, 2022 99 pounds is a bit steep for a product that the cat might refuse. Is there an alternative? Link to comment Share on other sites More sharing options...
Garald Posted December 7, 2022 Author Share Posted December 7, 2022 (edited) 2 hours ago, Radian said: Ubakus gives a 3mm sheet of polycarbonate a U-value of 4.444 W/(m²K) so if a regular kitty flap was 0.2m square (0.04m2) that would be a 3.5W loss with delta T of 20oC. The ones with a magnetic closer are pretty good at being draft free. Ah, interesting. You mean, like this one? https://www.amazon.com/Catwalk-W-MCD-Multi-Magnetic-Cat-Door/dp/B0016H9GK6?th=1 But that's a lockable one (opening for a specific cat with the right microchip or key around his or her neck). Are there simpler ones? Edited December 7, 2022 by Garald Link to comment Share on other sites More sharing options...
Radian Posted December 7, 2022 Share Posted December 7, 2022 18 minutes ago, Garald said: Ah, interesting. You mean, like this one? No, I don't think so. The magnetic item in that ones description is to do with the locking system. We had one where the plastic flap had a magnetic strip around its perimeter and this firmly pulled it into the closed position. It had no lock other than a two-way barrier selector. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now