Commercial flat roofing: guides & comparisons

In-depth, no-nonsense guides on membranes, build-ups, falls and ponding, guarantees and the decisions that matter for commercial flat roofing. Updated for 2026.

solar PV

Can a Commercial Flat Roof Carry Solar Panels?

Can a commercial flat roof carry solar panels? A ballasted array adds ~15-25 kg/m² plus uplift. The roof-before-PV survey and sequencing, explained.

Read guide → service life

How Long Does a Commercial Flat Roof Last?

How long does a commercial flat roof last? Single-ply 25-35 yr, mastic asphalt 50-60. Membrane lifespans, real guarantees and what actually shortens them.

Read guide → single-ply membrane

EPDM vs TPO vs PVC Single-Ply Flat Roof Membranes

Compare EPDM, TPO and PVC single-ply flat roof membranes: service life, seam type, cost per m² and which of the 3 suits your deck, loads and falls.

Read guide → repair or replace

Repair or Replace a Commercial Flat Roof: How to Decide

A whole-life framework for repair vs replace on a commercial flat roof: the 5 signals that mean strip-and-recover, and the honest cost of patch-and-hope.

Read guide → overlay

Overlay vs Strip-and-Recover: Single-Ply Re-Roofing

Overlay vs strip-and-recover for a commercial single-ply re-roof: the 4 conditions that allow an overlay, and when only a full strip is honest.

Read guide → ponding

Why Flat Roofs Pond, and How BS 6229:2025 Falls Fix It

Why does my flat roof pond? BS 6229:2025 sets a minimum finished fall of 1:80. How design falls, deflection and tapered insulation stop water sitting.

Read guide → warm deck

Warm Deck vs Cold Deck Flat Roofs: Why It Matters

Warm deck vs cold deck flat roofs explained: where the insulation and VCL sit, why cold decks rot, and the 1 build-up that controls interstitial condensation.

Read guide →