Most decking tends to have gaps in between those planks or plastic u call it. Then leaves or whatever rubbish might get into it and u never know, it might pile up underneath and when it does, water flow will be affected. Occasionally u need to open up and check, very troublesome ...no point la...
Imagine, it might become your mosquitoes breeding ground...
Hi Guys i recently engage Calvary Carpentry Pte Ltd to do up my balcony with Wood Plastic Composite.
So far no issues like water ponding and sagging of planks.
Pm me if you need their contact