Flat Roof Replacement—Design the Drainage, Insulation, and Details Before Choosing the Membrane.

No. A functional low-slope roof needs intentional drainage. The roof deck, tapered insulation, crickets, saddles, drains, scuppers, gutters, and overflow provisions work together to move water toward approved discharge points.

Common directions include self-adhered modified bitumen, heat-welded or otherwise approved multi-ply modified bitumen, TPO, PVC, KEE-enhanced membranes, built-up roofing, hybrid systems, and liquid-applied systems. The appropriate choice depends on slope, drainage, substrate, insulation, details, use, wind pressures, manufacturer approvals, and insurance requirements.

No. TPO can provide a reflective, heat-welded single-ply surface with relatively low weight. Modified bitumen can provide multi-ply redundancy and granulated surfacing. Neither is universally superior; the roof geometry, drainage, transitions, traffic, substrate, maintenance expectations, warranty, and approved assembly control.

PVC is a thermoplastic single-ply membrane. KEE-enhanced membranes use ketone ethylene ester chemistry within a PVC-based formulation to support flexibility and performance in demanding conditions. Exact formulations, reinforcement, thickness, approvals, accessories, attachment, and warranty terms vary by manufacturer.

The drainage cause should be investigated before selecting the replacement assembly. Blocked drainage, structural deflection, insufficient slope, compressed insulation, poor crickets, runoff from adjacent sloped roofs, and undersized or misplaced outlets may require different corrections.

Tapered insulation is manufactured in varying thicknesses to create or improve slope toward drains, scuppers, gutters, or roof edges. A tapered plan must account for existing deck slope, insulation height, door thresholds, curbs, parapets, transitions, wind design, drainage paths, and available construction height.

No. A reflective membrane can reduce solar heat absorption at the roof surface, while insulation controls heat flow through the assembly. Reflectivity, insulation, attic or ceiling configuration, ducts, windows, equipment, air leakage, and occupancy all affect comfort and energy use.

Sometimes, but only when the existing roof is a suitable, compatible, dry, well-adhered candidate with serviceable drainage and details. A coating does not remove wet insulation, correct structural deflection, or automatically create a new roof for insurance, code, or warranty purposes.

Some approved recover assemblies exist, but recover is not automatically appropriate. Existing layers, trapped moisture, deck condition, weight, adhesion, fire classification, slope, edge height, drainage, manufacturer requirements, code, and insurer acceptance must be reviewed.

The low-slope membrane may extend beneath the sloped roofing or terminate at walls, valleys, saddles, or curbs. Replacement can require removing and reinstalling adjacent roofing, underlayment, flashings, wall finishes, or edge metal to create a continuous water-control path.

Not necessarily. Occupied balconies, terraces, paver decks, and traffic-bearing surfaces may require specialized waterproofing, drainage, surfacing, guardrail, door-threshold, structural, and accessibility details that differ from a conventional non-occupied roof.

The assembly must match project-specific uplift demands. Deck type, insulation attachment, cover board, membrane attachment, adhesive or fastener pattern, perimeter and corner enhancements, edge metal, parapets, roof height, geometry, and the current approval all matter.

Tear-off may reveal rotten wood, wet insulation, damaged lightweight concrete, poor deck attachment, structural deflection, abandoned penetrations, inadequate drainage, low door thresholds, damaged parapets, improper HVAC curbs, or transitions that require additional work.

A project may involve a material warranty, a manufacturer system or NDL warranty when eligible, a coating warranty when applicable, and the contractor workmanship warranty. The written documents control coverage, exclusions, maintenance, notification, transfer, inspection, and remedy requirements.

No. A permitted replacement and documented mitigation features may support carrier review, and reflective surfaces or added insulation may improve thermal performance, but neither insurance savings nor utility reductions are guaranteed.

Aastro provides standard single-family flat and mixed-roof replacement pathways throughout Palm Beach and Broward Counties. Pahokee and Belle Glade are excluded from standard website coverage, and other locations may require manual review.