For one more week I am staying with my parents in their beautiful house on Mascoma Lake in Enfield, NH. The bedroom looks out over the lake with sliding glass doors. What a view!
But it was really cold in the bedroom the other day … It was 5F degrees outside; so I decided to see if I could find where that outside air was getting in. I used my infrared thermometer to measure the temperature all around the sliding glass and found the spots where outside air was coming into the bedroom. I marked up this photo where the coldest points were:
Right where the sliders are joined when the door is completely shut, there was fresh (cold!) air at 7F coming into the room. Along the bottom slider there was also a significant amount of cold air at about 22F. Perhaps this was a manufacturing problem in that the doors bowed away from each other rather than sealing nicely.
My dad and I went to the local Home Depot and bought a variety of insulating materials. We probably spent $5-10 on insulation tape, poly-foam caulk saver, and pipe insulation. Here are some pictures of the installation:
Aha! Now I read 40-50F where the sliding doors join and 35-40F along the floor. It is clear that there is still some colder air getting in around the joint of the bottom of the door to the floor… but this was a great improvement for about $5! Standard door draft snakes can help with the floor.
Now the bedroom is cozy and warm… next project are the other 5 sliding glass doors in the house!