Everyone has their own prefrences and you'll hear guys saying why one is better than the other. On my website I wrote a page about various options I think it'll explain alot... Flat Roofing Options
My personal prefrence is single ply membrane. There are several kinds of membrane, TPO, PVC and EPDM. You'll find alot of the PVC guys slamming TPO. You'll have to do your own research on that, I personally like the material. Although I also like PVC. What I like about TPO and PVC is the fact that the seams and penetrations are heat welded. I much prefer that to the adhesive seams on EPDM.
Single ply membrane can be installed in a number of ways; mechanically attached/fastened, fully adhered or ballasted. Ballasted EPDM is the cheapest roof, but your structure must be built to support it. On a roof of your size you won't notice any signifigant price benefit IMO. Youa lso have to remember that there are different mill thicnkesses of single ply, anywhere from 45 up to 90 and various different mills inbetween. Finally the roofing system is more than just the roofing memmbrane. There is insulation and flashing details as well that must also be considered.
You must consider all of these factors when selecting a low slope membrane and a method of installation. When I am meeting with customers I often ask their warranty requirements. Low slope roofing is rated anywhere from 10-30 years depending on system and installation method. Obviously a 30 year roof will cost more upfront but will last much longer so you must look at the entire life cycle of the roof. I personally never recommend anything less than 15 years and try to steer my customer towards the 20 year roof.
I don't know what the deck type is nor the insulation requirements, so I really can't make a suggestion... overall if the roof were mine I'd probably be looking at a fully adhered 60 mil PVC. I'd put on as much insulation as I could afford as it'll come back to me in energy savings over time.
My personal prefrence is single ply membrane. There are several kinds of membrane, TPO, PVC and EPDM. You'll find alot of the PVC guys slamming TPO. You'll have to do your own research on that, I personally like the material. Although I also like PVC. What I like about TPO and PVC is the fact that the seams and penetrations are heat welded. I much prefer that to the adhesive seams on EPDM.
Single ply membrane can be installed in a number of ways; mechanically attached/fastened, fully adhered or ballasted. Ballasted EPDM is the cheapest roof, but your structure must be built to support it. On a roof of your size you won't notice any signifigant price benefit IMO. Youa lso have to remember that there are different mill thicnkesses of single ply, anywhere from 45 up to 90 and various different mills inbetween. Finally the roofing system is more than just the roofing memmbrane. There is insulation and flashing details as well that must also be considered.
You must consider all of these factors when selecting a low slope membrane and a method of installation. When I am meeting with customers I often ask their warranty requirements. Low slope roofing is rated anywhere from 10-30 years depending on system and installation method. Obviously a 30 year roof will cost more upfront but will last much longer so you must look at the entire life cycle of the roof. I personally never recommend anything less than 15 years and try to steer my customer towards the 20 year roof.
I don't know what the deck type is nor the insulation requirements, so I really can't make a suggestion... overall if the roof were mine I'd probably be looking at a fully adhered 60 mil PVC. I'd put on as much insulation as I could afford as it'll come back to me in energy savings over time.
