Do plastic sheds get condensation?

Metal Sheds and plastic Sheds will only suffer from condensation when dampness is present in the foundations. The air inside the shed is always slightly warmer than outside and therefore, any moisture in the foundation base will rise until it touches the cold roof panels.

smgardensheds.com - Garden Sheds Base Preparation and Condensation Prevention

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CREATING A CONCRETE BASE

Step 1:

Decide where to position the building in an optimal space, allow enough distance from hedges or fences for easy access to all sides. Using pegs and string to mark out the base to the dimensions of the shed/foundation kit and measure diagonally to ensure the area is square. To get this to the right size you could build the foundation kit/shed base rails first and marks out using the outside edge of the framework.

Step 2:

A Concrete base requires 3 inch (7.5 cm) of compacted hardcore (not supplied) underneath the 3 inch (7.5cm) concrete layer. The base can be level with the ground or raised above it. If it is to be level excavate the top earth to 6 inch (15cm) to allow for the hardcore layer and the 3 inch (7.5cm) thickness of concrete. Level the area with a rake and remove the pegs.

Step 3:

Set up leveled framework if you have not got a foundation kit. Spread a layer of well compacted hardcore and cover with a liberal amount of sand. (Hardcore and sand not supplied)

Step 4:

Place a DPC (Damp Proof Membrane) on top of the sand. This is to prevent rising damp once the concrete has set. (Please note that the illustration is just to show the DPC, only use timber framework if you do not have the foundation kit option, as the foundation kit has its own shuttering). (DPC not Supplied).

Step 5: (If you have ordered a foundation kit)

Construct the foundation kit (if not already built) and lay it into your working area. Step 6: (If you have a foundation kit, construct the building before commencing with this stage) Lay DPM (Damp Proof Membrane) and mix the concrete (not supplied) using one part cement to five ballast or use bags of dry-mixed concrete to which you just add water. Small amounts of water should be added at a time and mixed into the concrete mix to ensure excessive amounts are added making the cement sloppy, as the concrete should be kept on the dry side.Spread the concrete evenly and slightly proud of the framework. This can be levelled off to the top of the foundation kit frame with a long straight edge of timber resting on the edges of the foundation kit or top of the formwork using a sawing motion slowly (as shown below) over the entire surface of the freshly laid concrete. You should be able to see the top surface of the foundation kit flush with the concrete. If wet weather is forecast, cover the concrete with polythene for 24-hours. In warm weather cover the base with damp sacks and sprinkle them with water over the 24-hour period, this will ensure the drying concrete will not shrink or crack. The result is a smooth, sound, level base. The perfect foundation for the construction of an outdoor storage building.

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