Low Slope Roofing: Difference between revisions
Jump to navigation
Jump to search
| Line 25: | Line 25: | ||
*'''MJ''' - Is EPDM also more durable than polyethylene - when compared in a buried application? I am seeing manufacturer reports of 40 year lifetime for polyethylene when not exposed to sunlight. Does EPDM exceed on this performance metric? | *'''MJ''' - Is EPDM also more durable than polyethylene - when compared in a buried application? I am seeing manufacturer reports of 40 year lifetime for polyethylene when not exposed to sunlight. Does EPDM exceed on this performance metric? | ||
**'''Half Off Ponds''' - [[Pond_Liner#30_Mil_LLDPE]] - 1/9/23. Yes, EPDM is going to be much more durable than the LLDPE liner. We typically say that the LLDPE polyethylene liner will last about 5 years while the EPDM should last 25 years plus depending on the application. Obviously the LLDPE can last much longer than 5 years but it would have to be an application where it is not being walked on and not near anything sharp since it is very easy to puncture. I personally have never heard of the LLDPE liner lasting anywhere near 40 years, potentially that was someone using an HDPE(high density) polyethylene liner and more durable than our LLDPE(low level density). If you plan on using this for the roof of a house then I would recommend only using EPDM. | **'''Half Off Ponds''' - [[Pond_Liner#30_Mil_LLDPE]] - 1/9/23. Yes, EPDM is going to be much more durable than the LLDPE liner. We typically say that the LLDPE polyethylene liner will last about 5 years while the EPDM should last 25 years plus depending on the application. Obviously the LLDPE can last much longer than 5 years but it would have to be an application where it is not being walked on and not near anything sharp since it is very easy to puncture. I personally have never heard of the LLDPE liner lasting anywhere near 40 years, potentially that was someone using an HDPE(high density) polyethylene liner and more durable than our LLDPE(low level density). If you plan on using this for the roof of a house then I would recommend only using EPDM. | ||
*If RPE good for primary roofing membranes? | |||
**'''BTL Liners''' - The short answer is no, we don't recommend reinforced polyethylene (RPE) as primary roofing membranes. One of the main technical reasons is the possibility of the liner "weeping" or allowing water vapor to creep through the membrane potentially creating a moisture layer between the roof and liner. Due to the "molecular space" created when inserting a reinforcing scrim between the coatings, water vapor can work its way into the liner albeit in miniscule amounts. Another main contributing factor is an RPE will grow and shrink depending on temperature and most roofs don't have that sort of tolerance. The other products you mentioned above are non-reinforced allowing for a tighter molecular structure that prevents vapor transmission. We now carry a product (RPEL 30) that has a thicker top coating on it to prevent the vapor transmission but you would still have the stretching and shrinking issue in a tight fit scenario. I hope this helps to answer your questions but please let me know if there's anything else I can help you with. v/r. Jim Nicholson, VP Product Development/Customer Relations | |||
BTL Inc. 920-779-0306 jim@btlliners.com. | |||
=Links= | =Links= | ||
*[[Pond Liner]] | *[[Pond Liner]] | ||
*[[Landfill Liner]] | *[[Landfill Liner]] | ||
Revision as of 16:26, 11 January 2023
About
- Puncture Resistance - RPE is 3x more resistant than EPDM - [1]
SBS
- SBS peel and stick - [4]. 3 ply. 10,000 sf in 160 hours, or 500 sf in 8 hours. Buy at Menards - [5]. 120 mil thick. 3 layers? Or can we do 1 layer + ballast? More info from another manufacturer - [6]
- Note - if it is multiple ply (2 or 3) - it is effectively like doing 2-3 roofs instead of one with EPDM. Proper termination detail still needs to be done at fascia and Bargeboard
- SBS Installation Video
EPDM
- Seam tape - $1/ft [7]
- Seam kit - $3/ft [8]
- Exterior seaming kit - $6/ft [9]
- EPDM - $1.2/sf [10]
- Seam primer [11]
Landfill Liner
- See Landfill Liner
Outdoor Carpet
Feedback
- MJ - Is EPDM also more durable than polyethylene - when compared in a buried application? I am seeing manufacturer reports of 40 year lifetime for polyethylene when not exposed to sunlight. Does EPDM exceed on this performance metric?
- Half Off Ponds - Pond_Liner#30_Mil_LLDPE - 1/9/23. Yes, EPDM is going to be much more durable than the LLDPE liner. We typically say that the LLDPE polyethylene liner will last about 5 years while the EPDM should last 25 years plus depending on the application. Obviously the LLDPE can last much longer than 5 years but it would have to be an application where it is not being walked on and not near anything sharp since it is very easy to puncture. I personally have never heard of the LLDPE liner lasting anywhere near 40 years, potentially that was someone using an HDPE(high density) polyethylene liner and more durable than our LLDPE(low level density). If you plan on using this for the roof of a house then I would recommend only using EPDM.
- If RPE good for primary roofing membranes?
- BTL Liners - The short answer is no, we don't recommend reinforced polyethylene (RPE) as primary roofing membranes. One of the main technical reasons is the possibility of the liner "weeping" or allowing water vapor to creep through the membrane potentially creating a moisture layer between the roof and liner. Due to the "molecular space" created when inserting a reinforcing scrim between the coatings, water vapor can work its way into the liner albeit in miniscule amounts. Another main contributing factor is an RPE will grow and shrink depending on temperature and most roofs don't have that sort of tolerance. The other products you mentioned above are non-reinforced allowing for a tighter molecular structure that prevents vapor transmission. We now carry a product (RPEL 30) that has a thicker top coating on it to prevent the vapor transmission but you would still have the stretching and shrinking issue in a tight fit scenario. I hope this helps to answer your questions but please let me know if there's anything else I can help you with. v/r. Jim Nicholson, VP Product Development/Customer Relations
BTL Inc. 920-779-0306 jim@btlliners.com.