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How far apart should shed roof joists be?

Wherever possible, joists should span the shortest distance. Common joists sizes are 200 x 50mm, 175 x 50mm, and 150 x 50mm. The joists will normally be placed at 400mm centres but no more than 600mm centres.

buildingregs4plans.co.uk - Guidance Flat Roof Structure - Building Regs 4 Plans

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Guidance - Flat Roof - Structure

Flat Roof Drainage Flat Roof Condensation Flat Roof - Structure Loading Flat roofs shall be designed to carry all imposed and dead loads acting on the structure of the roof. These may include: Dead loads- from the self weight of the roof construction. Environmental loads - such as snow, water and wind loads should be calculated in accordance with BS EN 1991.

Plant and equipment placed on it during its construction.

Traffic loads from roof maintenance equipment and personnel. Roof terraces and gardens must be able to carry the additional loads expected from foot traffic, planting and furniture etc. See a selection of our Roof Detail Drawings Uplift Flat roofs should be constructed to provide protection from wind uplift. This can be achieved by either being sufficient weight to prevent lifting or by fixing the joists to the wall plates and securing the wall plate with vertical holding down straps, at least 1m long and 30mm x 2.5mm in cross section at 2.0m centres. Wall plates are to be fixed to masonry using hardened nails 4mm in diameter x 75mm long or 50mm long wood screws if fixed into timber. The roof covering membrane may also require additional fixing using mechanical fasteners to prevent uplift high wind load areas. Timber Roof joists All roof timbers including joists, wall plates, blocking, strutting, battens, firrings and noggings must be preservative-treated unless the timber used is naturally durable. Sizing Joists The joists should be sized using either the TRADA span tables or BS EN 1995. The sizing and spacing will depend upon the loads imposed on them and the required span.

Wherever possible, joists should span the shortest distance.

Common joists sizes are 200 x 50mm, 175 x 50mm, and 150 x 50mm. The joists will normally be placed at 400mm centres but no more than 600mm centres. Packing Hard packing, for example tiles or slates bedded in mortar, can be used to ensure the joists are level. Loose or soft packing, including timber, should not be used. Fixing Joists The joists can be built into the wall or hung from joist hangers. The joist hangers must be the correct size for the joists and conform to BS EN 845. The joists should be placed on and fixed to a timber wall plate which is bedded in mortar on top of the inner skin and strapped down using galvanised holding-down straps. Fixing joists to an existing wall Where a new flat roof abuts an existing external wall, the joists can be hung on metal joist hangers which are fixed to a horizontal timber plate bolted to the wall. A cavity closer should be provided to the top of the walls to prevent fire spread and to stop damp air entering the roof space.

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What type of sheds last the longest?

Metal sheds are more durable as they are fire, insect, rot, and weather resistant. They can rust, but they are more durable to the elements vs. wood. Resin is the most durable because it's weather-resistant to fading, rusting, warping, rotting, insects, and fire.

keter.com - Resin vs Wood vs Metal Sheds: Which Material is Better - Keter

The final decision on what shed to purchase comes down to your personal preference. The differences between resin vs. wood vs. metal can be narrowed down into 4 categories: price, durability, maintenance, and assembly. When it comes to price, wood is the most expensive and least environmentally friendly option, the resin is the second-most expensive and the most environmentally friendly option, and metal is the cheapest but the hardest to transport and assemble. All three materials are durable and will be able to hold anything you store. But you’ll want to remember which options are going to last the longest through the harshest weather elements. Wooden sheds are not necessarily waterproof and are not resistant to fire or rotting. Metal sheds are more durable as they are fire, insect, rot, and weather resistant. They can rust, but they are more durable to the elements vs. wood. Resin is the most durable because it’s weather-resistant to fading, rusting, warping, rotting, insects, and fire. Assembly is the final factor to consider when purchasing a shed. Some wooden sheds are already built and just require you to install them. However, most wooden sheds are difficult to build and require a lot of work and patience. Metal sheds are also difficult to install and once they are built, it’s very difficult to transport a metal shed. Resin is the easiest to build and easy to move to a new location because of its lightweight material.

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