Question about that "stretch it tight" rule everyone swears by

I was at the supplier last Tuesday and overheard two old timers arguing about how much stretch is too much. One guy said he always cranks it so tight you can bounce a quarter off it, the other said that is exactly why seams are popping in new builds around Denver. It got me thinking - I used to believe the tighter the better, but after I had to redo a whole living room last month because the carpet pulled away from the tack strip after three weeks, I am not so sure anymore. The manufacturer spec for the carpet I used said 12% stretch, but that seems like nothing compared to what guys do on site. Does anyone else think we overstretch as a rule and that causes more callbacks than we admit? Or am I just being paranoid from one bad job?

3 comments

3 Comments

jamie7701mo ago

Tighter isn't always better, that 12% spec is there for a reason.

tara_patel1mo ago

Wait, 8%?! For YEARS? That's wild to me. I mean, I get that it worked, but the margin for error there has to be like... nonexistent. One bad batch of material or a temperature swing and you're looking at a total failure, right? The engineering tolerance is usually set where it is because of real world conditions, not just random numbers. Kind of makes me wonder what else I've been winging that actually has a tight spec I'm ignoring.

the_emery1mo ago

Honestly, reading that made me do a double take. Ngl, I had to check the spec sheet again because I always assumed tighter was like the whole point of tuning those joints. That 12% spec always seemed like a weird middle ground to me, but I guess there's actual engineering behind it. Tbh, I've been running mine at like 8% for years and never had a problem, so now I'm lowkey worried I've been doing it wrong this whole time.