Concrete Floor U Values

Using the figures above we can calculate the effective thermal resistance of the uninsulated floor m k w this is the reciprocal.

Concrete floor u values.

While the values do vary for each particular material and method of construction the following table gives general figures for some common modes of construction. U values of typical building methods u values overall coefficient of heat transmission indicate the heat flow through materials the higher the figure the higher the heat loss. The overall heat transfer coefficient the u value describes how well a building element conducts. Calculating the inverse of that 1 r would give you a u factor in the range of 1 67 to 0 83.

Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell. U value requirement floor 0 13 w m k. Corrections to u values of roofs walls and floors annex d of bs en iso 6946 provides corrections to u values to allow for the effects of. For example a wall with a u value of 0 25 would have a resistance value ofr 1 u 1 4 25 4 0.

For a 6 inch slab r value would be between 0 6 and 1 2. A reasonable r value for a normal concrete slab can be estimated using an r value the thermal resistance per inch of thickness between 0 1 and 0 2 and multiplying it times the slab thickness. Dt temperature difference o f k. U value requirement opaque doors 1 0 w m k.

Welcome to the jablite u value calculator for floors walls and inverted roofs. U value requirement windows whole window u value 1 4 w m k. Dew point temperature of value of floor room air at design maxi uo. H t u a dt 1.

H t heat flow btu hr w j s. U value requirement roof 0 13 w m k. Uninsulated u value u 0 21 0 25 0 36 0 50 0 62 0 73 0 83 0 92. U c u u.

There are a few good u value calculators online that if you are short on time are worth. Average heat transmittance mum relative humidity value of roof. The jablite u value calcutator gives instant access to multiple u value calculations for jablite insulation products in wide range of applications. The corrected u value u c is obtained by adding a correction term u.

U value has an inverse relationship to r value. For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. The heat transmission through a building wall or similar construction can be expressed as. Air gaps in insulation mechanical fasteners penetrating the insulation layer precipitation on inverted roofs.

A wall area ft 2 m 2. This easy to use interactive tool is designed to help calculate the thermal performance of varying combinations of insulation and blocks including aircrete and aggregate blocks. 8 2 equivalent r values for concrete walls and rofs.