Types of Polycarbonate Sheets Choosing the right sheet depends on whether you want maximum light or better heat insulation: Solid/Compact Sheets: These are crystal clear (90% light transmission) and look like glass but are 200 times stronger. Best for sit-outs and balconies. Multiwall/Hollow Sheets: These have layers with air gaps, providing excellent heat insulation—perfect for Chennai’s summers to keep the area underneath cool. Embossed/Textured Sheets: These diffuse light to prevent glare and offer a bit of privacy while still being transparent. Corrugated Sheets: Often used for industrial sheds or small garden structures due to their strength-to-weight ratio.