I think a lot depends on how tight you pull it when you are tacking around perimeter. Never could see any difference. The stuff only shrinks so much & if you don`t pull it tight when installing you will get sag. Way back in my mind I some times have a little guy that tells me things. One that if it did have a direction the manufacture would have told us! As much as they have sold they would want it installed right! May be a difference , but I bet it would be so slight it`s not noticeable!
>>>>>>>>>>>>>>big max 1935>>>>>>>>>>>>>>>.