What do you put under TPO roofing?

Sometimes an underlayment is needed under the insulation layer. The underlayment is normally a 5/8" gypsum board and is typically installed when an improved fire resistive rating is required or to create a solid substrate on top of a fluted metal deck.

Does TPO roofing need underlayment?

Thermoplastic Polyolefin (TPO)

TPO roofs can resist UV rays by reflecting the light off its surface. This makes TPO ideal for buildings that need an effective insulation system. TPO underlayment is relatively easier to install. A hot-air gun is used to melt the rubber down to fuse each sheet together.

Can TPO go directly plywood?

TPO is a single-ply membrane that can be installed over the top of the plywood. Although there are different types of roofing material, like metal or wood shingle roofs, this type provides an alternative because it's much cheaper.

How is TPO roofing applied?

The TPO membrane can be applied in 3 ways: fully adhered with bonding adhesive; mechanically attached; or mechanically attached just at the seams. TPO is always heat-welded at the seams and at accessories. Heat welding creates a monolithic bond between sheets or from sheet to accessory.

What is the minimum slope for a TPO roof?

Thermoplastic single-ply roofing systems are plastic sheets (PVC, TPO, CSPE) that are welded together with hot air. This creates a shingle sheet that provides the weather protection for the building. Both the Thermoset and the Thermoplastic must be installed at a minimum one- fourth-inch-per-twelve-inch slope.

"How to Install TPO Roofing" by RoofRepair101

How long does TPO roof last?

80-mil TPO roofs come with up to a 25-year warranty and with the appropriate maintenance, it is not uncommon for a TPO roofing system to last as long as 30 years.

Can you coat a TPO roof?

Silicone and acrylic coating systems are both great choices for restoring and extending the life of a TPO roofing system.

Can PVC Weld to TPO?

Heat welding of PVC and TPO works perfectly around these roof units. The technicians will seal the membrane seams, stopping moisture from dripping through around the base.

Are cant strips required for TPO?

Elastomeric and plastomeric single ply roofing systems do not require cant strips nor are they recommended. Single ply membranes are flexible enough to be easily bent and conform to an acute (90°) angle without stressing the membrane.

What is TPO roofing membrane?

TPO (thermoplastic polyolefin) is a single-ply white membrane used in both commercial and residential roofing. Due to TPO being a white membrane, it reflects heat instead of absorbing it. If you have a flat roof or a low-slope dormer over a bedroom, TPO is a great option because it'll keep the room below cooler.

Is TPO roof glued down?

A TPO roof can be installed fully-adhered, mechanically-attached or ballasted. When the TPO roof is fully adhered it means that the membrane was glued to the substrate using a special strong adhesive that creates a chemical bond with the TPO.

Is TPO better than tar and gravel?

Often times you will find that TPO is actually cheaper with many advantages whereas Tar & Gravel has more disadvantages. When it comes to environmental questions both help with UV light in that it will reflect or absorb the UV light for roof longevity.

What is TPO primer?

A solvent-based product designed for one-step cleaning and priming of TPO surfaces to be bonded with In-Seam Tapes, Uncured Flashing Tapes, Cured Cover Tapes, and Pre-Taped membranes.

Does silicone stick to TPO?

Lots of products will not adhere to EPDM-TPO roof membrane (like silicone). Others delaminate the membrane, like petroleum and citrus based cleaners. I'll check out that Alpha 1010 to see if it's TPO-plastic roof approved. This might help!

Is TPO better than EPDM?

TPO has better dimensional stability than EPDM. EPDM is more likely to shrink which can cause a variety of problems on your roof.

How thick is TPO roofing?

TPO is typically sold in thicknesses of 45 mil, 60 mil and 90 mil. In Indiana, we typically see 45 mil and 60 mil specified. The thicker the membrane, the better the long term durability.

Is TPO waterproof?

If you're curious about TPO waterproofing membrane specification. Here's where the magic happens: a TPO's hot air-welded seams make it 100% resistant to water penetration. Unlike PVC, property owners enjoy a leak-proof roof for a long period of time.

Which is better felt or synthetic underlayment?

The lightness of synthetic underlayment makes it easier and safer to install than asphalt felt. Synthetic underlayment is much more tear-resistant when exposed to high winds and foot traffic than asphalt felt underlayment.

What is the lowest pitch a roof can have?

The smallest pitch of a roof is 1/4:12, which translates to 1/4 inch rise to 12 inches of run. Such a small pitch can only work with built-up roofing or specialized synthetic roofing. Covered porches that are near trees or in areas with heavy rains should not be covered with a low-slope roof.

What type of roofing is best for a low pitch roof?

Rubber roofs are a top choice for flat or low pitched roofing as it adheres to the roofing materials below it and, when installed correctly, provides a watertight seal to the elements. Choosing the best low slope roof materials often comes down to weighing the pros and cons based on your home and your needs.