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Every guide on the site, grouped by topic the same way as the category pages, followed by the tools and the pages about us.
Crawl spaces
How a crawl space works
- Crawl spaces: how they work and what can go wrong
- Crawl space humidity and moisture
- Crawl space vents: open or closed?
- Crawl space insulation: floors, walls and rim joists
Encapsulation
- Crawl space encapsulation: what it is and when it’s worth it
- Crawl space encapsulation cost and repair prices
- Crawl space vapor barriers and liners
- Crawl space dehumidifiers
Water, mold and air
Basements
Water and waterproofing
- Water in the basement: where it gets in and what to do first
- Basement waterproofing: interior vs. exterior
- Basement waterproofing cost: what each fix costs and what's in the price
- Flooded basement: what to do and how to prevent it
Finishing a basement
Egress windows and window wells
Foundations
Foundation guides
- House foundation types: slab, crawl space, basement and pier and beam
- Foundation cracks: types and when to worry
- Foundation settling: what's normal and what's a problem
- Horizontal cracks and bowing basement walls
- Sill plates and rim joists: what they are and how they fail
Inspection and repair
Water & drainage
Drainage
- Yard grading: how to slope the ground away from your foundation
- Downspout drainage: how far, how to extend it and when to bury it
- What is a French drain? How it works and when it helps
Sump pumps
Moisture & mold
Humidity and condensation
- Basement humidity: ideal levels and how to measure
- Basement dehumidifiers: size, drainage and placement
- Dew point and condensation on basement walls
- Musty and sewer smells in the basement
Mold
- Mold in basements: causes, cleanup and when to call a pro
- Black mold: what it is, what it isn’t and what to do first
- White mold, efflorescence or mildew? How to tell what’s on your basement wall
- Mold on wood: joists, subfloors and sill plates
- Mold inspection and testing: when it’s worth it
- Mold remediation cost in crawl spaces and basements
Home hazards
Radon basics and testing
- Radon in your basement: where it comes from and what to do
- How to test for radon: short-term vs. long-term tests
- Radon levels chart: what your test result means
Fixing radon
- Radon mitigation systems: how they work and what a good install looks like
- Radon mitigation cost: what a system costs to install and run
- Radon fan replacement and system checks: is your system still working?
Asbestos
Insurance & claims
What insurance covers
Tools
Calculators and checkers
- Dehumidifier size calculator
- Dew point calculator
- Can I clean this mold myself?
- Radon result checker
- Basement coverage checker
Printable checklists
About Below the Sill
- About us
- Robert Stulpt, Author
- Daniel Mercer, Structural Contributor
- Graham Whitlock, Asbestos & Environmental Safety Contributor
- Nathaniel Calderbrook, Home Insurance & Claims Contributor
- Editorial policy
- FAQ
- Contact
- Search