Why is my bathroom so cold?
January 7, 2013 6:56 AM Subscribe
Am I losing all my heat through a large glass block window?
posted by teg4rvn to Home & Garden (8 answers total)
My bathroom has a large glass block window which is north facing. Is is 7 blocks wide by 6 blocks high, so the the "window" is 56" x 48" In between the glass blocks is grout.
The room is always 10 degrees colder in the winter and 10 degrees warmer in the summer. It is not that far from the furnace. There is also a Jacuzzi tub that has its vent to the the same outside wall.
A while ago I had a friend who claimed to have HVAC experience and he said that glass block is notoriously inefficient. In particular, I recall a story he told about having a client who insisted on having a HUGE glass block window in their bathroom and it required an entirely separate A/C compressor to keep the room cool (we live in desert with summer temps approaching 110). But in researching my problem I am reading that glass brick should not be that bad of an insulator. Can it the grout?
I know anyone who wants to give a serious answer will need to qualify their answer based upon the size of the room and output of the furnace, number of registers and returns, etc.. FWIW, I just want to get an overall impression about glass block windows (should they have used grout in between blocks?) and their insulating capacity.