Floors, ceilings and roof insulation - The Hempcrete Topic: Designing and Building with Hemp-lime - page 380

Ceilings and roof insulation
When cast around a reinforcing timber frame, hempcrete can be used to form ceilings and
provide insulation at roof level. Although not widely used in this way in the UK, these ap-
plications are perfectly possible, and all of the binder products currently on the market are
suitable for them, according to their manufacturers' technical specifications.
At Hemp-LimeConstruct we have successfully used cast-in-situ hempcrete for both roofs
and ceilings, usually in situations where it was important to the client to keep the use of
processed, high-embodied-energy materials to a minimum.
Ceilings
Cast hempcrete is suitable for ceilings inside either flat or pitched roofs, or between floors
where there is cast-in-situ hempcrete insulation directly above the ceiling. Hempcrete ceil-
ings are never cast independently of hempcrete insulation. Cast-in-situ hempcrete is rarely
used for downstairs internal ceilings and insulation between floors, since the extra expense
is prohibitive, unless increased acoustic or thermal insulation is required between different
parts of the building.