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# > R-Value Wall Area Calculator

Use this calculator to work out for a wall or ceiling how much heat is being lost through it. Useful to help you in working out how much heating or insulation you need.

Values for the whole wall

This is the total wall size and R-Value.

Values for the inset within the wall

This is for the inset into the wall (say a window).

To get best benefit from this calculator you need to do the following:

1. Work out the dimensions and R-Value for the wall construction itself.
2. Then if required work out the dimensions and R-Value for the inset (usually a window) in the wall
3. Enter the total wall dimensions and R-Value into the calculator above, then enter the dimensions and R-Value for the inset
4. Note the total R-Value and the energy loss figures.

Remember, the values calculated here should be taken as a rough guide, it does not take into account other effects (like draughts and heat or cooling sources) in the room.

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• Nounours said:

I would like know the r-value of a inflatable wall (such as a inflatable castle for kid). The wall will be 9 feet thick and pressurized a 0.33psi. I would appreciate your help for this r-value.

ON Mon, 15 Aug 11, 5:50am probably from Canada  Reply to this comment

• Cheesecaker said:

Thickness of the wall aside, to keep a wall like that at pressure air must continually be pumped in. This means that there is no still-air present in the wall to hold the heat. Therefore (theoretically) the only thermal resistance comes from the material from which the wall is made.

ON Sun, 12 Aug 12, 9:40pm probably from New Zealand  Reply to this comment

• Dominic said:

I am trying to calculate the R value of flooring materials. Different from walls? With a view to calculating possible floor coverings for underfloor heating. Any comments? Thanks

ON Mon, 24 Nov 14, 9:19pm probably from United Kingdom  Reply to this comment