Frequently Asked Questions — Aluminium Decking & Caribbean Outdoor Living

A GT MAT aluminium deck has an estimated lifespan of 30 to 50 years in tropical conditions. Aluminium does not rust, does not warp and needs no particular upkeep, even by the sea.

An aluminium deck is fully metallic — structure and boards — offering very high resistance. A composite deck combines an aluminium structure with composite boards (wood + plastic) for a warm, natural-wood look without the maintenance.

GT MAT aluminium boards carry an anti-heat coating that limits thermal absorption. Their openwork design also lets air circulate under the surface, keeping it comfortable even in full sun.

GT MAT builds decks from 10 m². Most of our residential projects run between 20 and 80 m².

Yes — it is actually the most common case. GT MAT installs aluminium decks over concrete slabs, existing tiles or directly on adjustable pedestals depending on your outdoor space.

Yes. GT MAT aluminium pergolas are dimensioned to withstand Caribbean cyclone winds — wind-certified 160-180 km/h (Classic) and 180-220 km/h (Premium). The extruded aluminium structure and reinforced anchoring provide strong performance even in extreme conditions.

In the French territories, a pergola under 20 m² needs a prior works declaration; above 20 m², a building permit is required. GT MAT supports you through the paperwork. Rules differ in Sint Maarten — ask us.

A bioclimatic pergola has motorised adjustable louvres that adapt to sun and rain — perfect for the Caribbean climate. A classic pergola has a fixed roof (fixed slats or polycarbonate).

Yes — GT MAT offers side-closing options: louvred awnings, glass windbreaks, outdoor curtains or aluminium screens, to create a sheltered outdoor living room.

French standard NF P01-012 requires a minimum height of 1 metre for railings protecting a drop of more than 1 m. GT MAT builds all its railings to the standards in force.

Absolutely. Powder-coated aluminium is the reference material for railings in a marine environment. Unlike steel, it does not rust in salt air.

Yes — GT MAT builds mixed aluminium + tempered glass railings that keep the view open while ensuring safety. A favourite for sea-view terraces.

Fill in our online form or call us on +590 691 25 95 13. A GT MAT expert answers within 48 h — in English — and surveys your project free of charge.

After the quote is approved, count 7 to 45 days depending on the surface and the technical specifics. Combined projects (deck + pergola + railings) sit at the top of that range. For the northern islands, add shipping.

Installations in the French West Indies carry the ten-year structural warranty required by French law (garantie décennale). For projects outside the French territories — Sint Maarten in particular — the applicable warranty terms are stated in writing on your quote.

GT MAT is based in Guadeloupe and Martinique and mainly works across both islands. For Saint-Martin, Sint Maarten and Saint-Barthélemy, contact us — freight and local taxes are itemised on the quote.