Aluminum Eavestrough Vs. Thermal Expansion

Post Topics: Blog

We’ve all experienced the different temperatures of the seasons throughout the year, and our bodies react differently to each one. Well, eavestrough does the same thing and it’s called thermal expansion, which causes distortion. This happens when the material is exposed to the changes in the temperature, and then begins to either expand or contract which is conflicting with the hangers that are supporting the eavestrough up.

For an example, if a 35’ piece of eavestrough was installed at 10℃ it will expand by ½” at 40℃. That ½” is enough to cause damage, such as: oil canning, buckling or in extreme cases, splitting of the eavestrough.

There are precautions that can be done to eliminate the possibility of these things happening:

1. Limit the run of your eavestrough, as it’s recommended that lengths should not exceed 50’. If the job needs longer than 50’ lengths, the best solution would be to run shorter lengths, install with a small gap in between and secure an end cap on either end. This ensures that there are no chances of damages happening, and a flashing can be installed overtop to make it look appealing.

2. Since temperature plays the biggest role in thermal expansion, it’s best to avoid installing the eavestrough in cooler temperatures. The best temperature range to install eavestrough would be 15-30℃. *Check out our expansion chart

3. Make sure to regularly adjust the trough machine to guarantee the eavestrough is formed without any curving or buckling happening.

4. Trough run off stands should be placed every 10’ level and lined up perfectly with the trough machine for support. This helps prevent any stretching or distorting of the eavestrough.

With these suggestions you may reduce the chances of damages occurring, which saves time, money, and keeps the eavestroughs performing like new for years to come.

If you’d like to take a look at BMI’s Eavestrough Expansion Chart to be informed about at what temperature eavestrough either expands or contracts, click here.


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