Tapered ISO · Heat-Welded TPO Fleeceback · Eliminates Ponding Water · All Permits Handled

Tapered insulation uses polyisocyanurate (ISO) boards that are cut at a precise angle — typically creating a slope of 1/8 to 1/4 inch per foot — across the entire roof surface. Unlike a flat deck that relies entirely on drains, a tapered system creates a positive drainage plane from every point on the roof toward the drains. Water moves off the surface efficiently after every rain event rather than pooling in low spots.

In South Florida where flat roofs receive 60+ inches of rainfall per year, eliminating ponding water is not just about code compliance — it is the single most effective way to extend flat roof membrane life. Standing water accelerates membrane deterioration, adds structural load, and eventually finds its way through any seam or penetration. A properly designed tapered system can extend the life of a TPO membrane by 30 to 50% compared to the same membrane installed on a flat deck.

Standard TPO membrane is a single-ply thermoplastic sheet — lightweight and flexible, with good UV and heat resistance. TPO fleeceback has an additional polyester fleece layer laminated to the underside of the membrane. This fleece backing dramatically increases the membrane's puncture resistance and dimensional stability, and provides a superior bonding surface for adhesive attachment to the ISO insulation below — creating a fully adhered system that resists wind uplift far better than mechanically fastened alternatives.

The result is a composite roofing system — TPO fleeceback bonded to tapered ISO — that performs as a single integrated assembly. The fleece backing also prevents the adhesive from soaking through the membrane and affecting the top surface, ensuring a consistently smooth, reflective white finish across the entire roof. AGK installs TPO fleeceback as the standard membrane on all tapered ISO projects because it is simply the superior choice for South Florida's climate and wind conditions.

Heat welding uses calibrated hot-air welding equipment to fuse TPO membrane seams at precisely controlled temperatures — creating a thermoplastic bond where the two membrane surfaces literally melt together and become one continuous sheet. This weld is stronger than the membrane itself. There is no adhesive, no tape, no uncertainty about cure conditions — the weld quality is verifiable and consistent across every linear foot of seam on the roof.

Torch-applied modified bitumen requires open-flame propane torches on the roof surface — creating fire risk during installation and relying on the installer's judgment to achieve consistent heat application. Cold-process adhesive seams depend on adhesive cure conditions and application consistency — and are vulnerable to South Florida's UV and thermal cycling over time. Heat-welded TPO seams have no open-flame risk, no cure variability, and no long-term degradation pathway. It is the only seaming method AGK uses on TPO membrane systems.

No — tapered ISO with TPO fleeceback is excellent for larger residential flat roofs as well, not just commercial buildings. In South Florida, many high-end residential properties, multi-family buildings, townhomes, and commercial properties share the same flat roof challenges — ponding water, heat gain, and the need for a long-lasting, low-maintenance system. The tapered ISO + TPO fleeceback combination addresses all of these simultaneously.

The system is particularly well-suited for South Florida residential properties with large flat roof areas where ponding water has been a persistent problem, where energy efficiency is a priority (the reflective white TPO surface significantly reduces cooling loads), or where the owner wants the highest-performing and longest-lasting flat roofing system available. AGK designs and installs tapered systems for both commercial and residential clients throughout Miami-Dade and Broward County.

A tapered ISO + TPO fleeceback system is a premium roofing solution — it costs more than a standard modified bitumen flat roof. The additional cost reflects the tapered insulation layout design, the precision-cut ISO boards, the TPO fleeceback membrane upgrade, and the heat-welding equipment and expertise required for proper installation. For commercial and larger residential properties, this premium is typically recovered through reduced energy costs, extended membrane life, and elimination of the recurring maintenance costs associated with ponding water issues.

AGK provides detailed written proposals after a free site assessment — including the complete tapered insulation layout design, all material specifications, permit costs, and warranty information. Because tapered ISO systems are designed specifically for each roof's dimensions and drain locations, pricing requires an on-site assessment. Call (954) 807-3455 to schedule your free assessment.

Yes — a tapered ISO + TPO fleeceback roof replacement requires a building permit in every city and municipality across Miami-Dade and Broward County. The permit application must include the TPO system's Florida Product Approval NOA with HVHZ designation, ISO insulation specifications, drainage calculations, and the detailed installation method documentation. Tapered insulation systems require more detailed permit documentation than standard flat roof replacements — AGK prepares and submits everything.

We manage the entire permit process from application through final inspection closure. You never deal with the building department at any stage. A properly permitted and inspected tapered ISO + TPO system provides complete documentation for your insurance carrier, property records, and any future real estate transaction.

A properly installed TPO fleeceback system on a tapered ISO substrate typically lasts 20 to 30 years in South Florida's climate — significantly longer than standard modified bitumen systems in the same environment. The combination of positive drainage from the tapered insulation (eliminating ponding water), the fleeceback reinforcement (improving membrane durability and wind resistance), and the heat-welded seams (eliminating the primary failure point of flat roofing) creates a system that performs at the upper end of TPO's lifespan range.

Key maintenance requirements are minimal — periodic inspection of penetration flashings and edge details, keeping drains clear, and addressing any physical damage from rooftop equipment or foot traffic promptly. Unlike modified bitumen, TPO fleeceback does not blister, crack from UV exposure, or require recoating. AGK provides complete warranty documentation from the membrane manufacturer in addition to our workmanship warranty.