The Australian Building Codes Board’s Construction Of Buildings In Flood Hazard Areas information handbook defines “flood” as “the temporary condition of partial or complete inundation of normally dry land”, due to the, “overflow of inland or tidal waters or the rapid accumulation of runoff or surface water from any source”.
When your home is impacted by a flood event, it can result in a significant and unplanned for financial burden. Ideally, buildings are strategically located to avoid flood prone land. However, where that isn’t possible it is essential that your home is designed to ensure that it is structurally compatible with flood water during a 100-year Average Recurrent Interval (ARI) flood event.
When designing and building your home in a flood zone, specific building materials and construction methods that are less prone to water damage should be used. All Spantec products are recommended for flood zones
When renovating or designing a building on flood prone land the following factors must be considered:
Design factors such as the location of electrical services, sewerage systems and water tanks need to be carefully considered when designing you home on flood prone land. Follow the below guidance to ensure that you minimise the chance of damage to services in a flood event.
|Suitable materials & construction methods||Unsuitable materials & construction methods|
|Foundations||• Reinforced concrete slab.
• Galvanised steel ezipiers & columns.
• Masonry piers/columns.
|· Timber piers.|
|Roof||• Timber trusses with galvanised connections.
• Reinforced concrete.
• Galvanised metal construction.
|• Traditional timber roof frame construction.
• Inaccessible flat roofs.
• Non-galvanised structural steelwork or connections.
|Windows||• Aluminium frames with stainless steel or brass rollers.
• Timber frame, fully epoxy sealed. before assembly with stainless steel or brass fittings.
|• Timber with PVA glues.
• Mild steel fittings.
• Large windows low to the ground.
|Walls||• Reinforced or mass concrete walls.
• Cavity brick walls.
• Fibre cement sheet.
• Face brick or block work.
• Cement render.
• Ceramic wall tiles.
• Galvanised steel frames or sheets.
• Glass and glass blocks.
• Stone, solid or veneer.
• Plastic sheeting or tiles with waterproof adhesive.
• Common bricks.
• Stolid wood, fully sealed.
• Stainless steel frames.
• Aluminium frames.
|• Timber frames in areas that are subject to force from fast flowing water.
• Inaccessible openings.
• Brick/block veneer with venting (stud frame).
• Particle board.
• Fibreboard or strawboard.
• Cloth wall coverings.
• Standard plywood.
• Gypsum plaster.
• Exterior grade plywood.
• Solid wood with allowance for swelling.
• Exterior grade particleboard.
|Floor||• Steel sub floor (Boxspan or equivalent).
• Slab on ground or suspended concrete slab.
• Suspended timber floor.
• Marine grade plywood.
|• Timber floor close to the ground and particle board close to the ground.
• Standard grade plywood.
|Bolts, nails, hinges and fittings||• Brass, nylon/stainless steel, removeable pin hinges.
• Galvanised steel, Aluminium.
|• Mild steel.|
|Doors||• Solid panel with waterproof adhesive.
• Flush marine ply with closed cell foam.
• Aluminium or galvanised steel frame.
• Flush or single panel marine ply with waterproof adhesive.
• Timber frame, fully epoxy sealed before assembly.
|• Standard timber frame.
• Standard flush hollow core with PVA adhesive and honeycomb paper core.
|Installation||• Clay/concrete tiles.
• Epoxy or cementitious floor toppings on concrete.
• Rubber sheets (chemically set adhesives).
• Vinyl sheet (chemically set adhesive)
• Rubber tiles (chemically set adhesives).
• Vinyl tiles (chemically set adhesives).
• Polished floor and loose rugs.
• Ceramic tiles.
|• Loose fit nylon or acrylic carpet (closed cell rubber underlay).
• Wall to wall carpet.
• Wall to wall seagrass matting.
Steel building products from Spantec will help protect your home in a flood event due to being impervious to water, unlike timber building products. Here are three Spantec products we recommend when building in a flood zone.
Flood zone buildings have to be raised off the ground, and with the steel Boxspan Floor System, coupled with our Ezipier and Ezibrace solutions, you will be able to build your home to last in a flood zone. We can design and engineer your floor frame, footings and bracing for your project in house. Contact us today for a quote.