Technical notes
How Membrain reads building moisture problems
These notes explain the diagnostic reasoning behind Membrain's public guides: what a pattern can suggest, what argues against it, which evidence matters next, and where a photo is not enough.
These notes explain mechanisms and evidence. Product selection and application requirements remain tied to current approved manufacturer documents.
Reading a moisture pattern before naming a cause
How the direction, extent and location of dampness narrow the likely water path before anyone recommends a repair.
Read technical noteIngress from above: terrace, roof slab and the floor overhead
How leakage from a terrace, roof or floor above usually presents, what weakens that explanation, and what evidence helps separate it from other causes.
Read technical noteFacade and opening ingress: external walls, windows and doors
How rain enters around external walls and openings, and how to distinguish local window or facade ingress from water arriving from above.
Read technical notePlumbing and service leakage
How concealed supply and drainage leaks differ from weather-driven seepage, and why usage patterns can be more useful than another photo.
Read technical noteCondensation, and how it differs from ingress
A practical way to distinguish surface condensation from water travelling through a wall, slab, joint or opening.
Read technical noteRising and ground moisture
What a genuine bottom-up moisture pattern looks like, what commonly mimics it, and why low-level damp should not automatically be called rising damp.
Read technical noteInternal wet-area transfer
How water from a bathroom, kitchen, utility or balcony reaches an adjoining room or ceiling below, and how it differs from a concealed pipe leak.
Read technical noteConstruction joints, interfaces and penetrations
Why water often enters where two materials or building elements meet, and how a linear stain can reveal the route without proving the source.
Read technical noteWhat a photograph cannot establish, and when to escalate
The boundary between useful photo-based guidance and the point where a site inspection or instrument test is the right next step.
Read technical noteHow these notes are governed
The notes above are the diagnostic guidance in Membrain's technical knowledge library. They are deliberately separate from product data sheets: diagnosis explains what may be happening; manufacturer documents govern the repair system and its application.
Read the full methodology