Site drainage and foundation map
Follow rain from roof area to discharge, grade, drains, soil and the foundation boundary.
Follow rain from roof to gutter, downspout, grade, drains and foundation boundaries.
Same building. Different hidden stories.
Watch the pathway unfold
Each simulation separates trigger, transport route, visible symptom and verification.
Foundation movement opens a diagonal crack
Differential support or movement redistributes stress around openings and finishes.
A blocked gutter wets the foundation
Overflow concentrates roof runoff beside the wall, increasing splash, soil moisture and below-grade water pressure.
A short downspout extension recycles water at the foundation
Roof runoff exits too close to the wall and repeatedly loads the same soil and foundation area.
Slab edge creates a cold floor band
Heat flows through a concrete perimeter with limited insulation, creating a repeatable cold strip inside.
See what the layer does to the material
Materials record exposure differently. Their response can reveal a pathway without proving the source.
Foundation coating under water pressure
A surface coating cannot reliably resist persistent water pressure from saturated soil.
blisters, seepage at cracks and recurring dampness → ▧MortarMortar joints under concentrated runoff
Repeated water flow erodes weak joints and opens pathways behind masonry.
recessed joints, sand loss and localized dampness → ▧Roof MembraneRoof membrane under ponding water
Persistent water loads seams, penetrations and weak drainage details for longer periods.
dirt rings, algae, seam stress and delayed leakage → ▧Wood SidingWood siding with trapped backside moisture
Missing drainage or tight coatings slow drying and concentrate decay at edges and end grain.
paint failure, soft lower edges and joint staining →The diagram suggests routes.
The real trigger decides.
Describe what changed, where it happened and what weather or operating cycle came first.
