Size a sub-slab depressurisation system and estimate the post-mitigation level.
A single suction point can serve a large area over clean gravel but very little over clay, which is why the sub-slab material drives the design. Well-designed systems typically achieve 80 to 95 per cent reduction. Radon is a leading cause of lung cancer after smoking, and because concentration varies by season and by house, post-mitigation testing is not optional.
Radon Mitigation
Suction points = slab area ÷ area served per point, which depends on sub-slab permeability
This is a system sizing estimate, not a health assessment or a substitute for measurement. Radon levels must be confirmed by testing before and after any mitigation work, and design should be carried out by a qualified radon professional.
Suction points = slab area ÷ area served per point, which depends on sub-slab permeability A single suction point can serve a large area over clean gravel but very little over clay, which is why the sub-slab material drives the design. Well-designed systems typically achieve 80 to 95 per cent reduction.
Radon is a leading cause of lung cancer after smoking, and because concentration varies by season and by house, post-mitigation testing is not optional.
This calculator takes 5 inputs: Slab area, Measured radon level, Sub-slab material, Expected system efficiency, Action level. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.