These mistakes come up again and again, and the result is a sheet that does not last or a project that does not look right.
1. Choosing on price alone
The cheapest sheet may be recycled material or underweight, forcing a replacement within a year or two.
2. Ignoring weight
Ask for the sheet weight, not just thickness — it is one of the clearest quality indicators.
3. No UV protection
In sun-exposed locations, an unprotected sheet will yellow and crack quickly.
4. Thickness unsuited to the spans
If supports are far apart and the sheet is thin, it will sag.
5. The wrong colour for the use
Clear sheets over a space occupied all day can make it very hot.
6. Ignoring accessories
The right tapes, screws and washers are essential to roof life.
7. Not asking for advice
A quick word with the manufacturer before buying can save you a lot.
The Polyee Plast team offers free advice. Message us on WhatsApp before you buy.
