What is the white haze on my tiles that keeps coming back?
A white bloom that returns after cleaning is usually salts carried out by moisture, not leftover grout — and the two need completely different responses.
beginner30 min2 min read
Home & DIY
Practical answers for repairs, cleaning, decorating and the household problems that turn up whether you planned for them or not. Written so you can start with what you already own.
2,154 guides
What size internal door do I need?
How to measure for a replacement door, why the old door is a better guide than the opening, and what to do when nothing in the catalogue matches — which is common in older houses.
beginner15 min4 min readWhat size is a sheet of plywood, MDF or plasterboard?
The standard formats, the smaller sizes worth knowing about, and the 40mm difference between a board sheet and a plasterboard sheet that catches people out.
beginner6 min4 min readWhich direction should I feed a router?
One rule that produces two apparently opposite answers: anticlockwise around the outside of a board, clockwise inside an aperture, and reversed again on a router table.
beginner10 min4 min readWhich front door lock do I actually need?
What BS3621, TS007 and Sold Secure mean, what insurers usually ask for, and how the requirements differ between a timber and a uPVC door.
beginner20 min3 min readWhich paint brush should I buy for which paint?
Filament type matters more than price: natural bristle for solvent paints, synthetic for water-based, and the sizes that actually earn a place in a domestic kit.
beginner10 min4 min readWhich shelf material and thickness will not sag over my span?
How sag actually scales with span and thickness, what each common shelf board can genuinely span, and why a front lipping beats a thicker board.
beginner15 min4 min readWhich vacuum cleaner filters can be washed, and how often do they need changing?
Most vacuums have two or three filters doing different jobs. Telling washable from replace-only, and knowing the interval for each, is what keeps a machine performing like it did in the first month.
beginner15 min5 min readWhich varnish should I use — polyurethane, acrylic or yacht?
Four families with genuinely different jobs: what each resists, what each does to the colour of the wood, and why yacht varnish is the wrong answer to most questions.
beginner12 min4 min readWhich wood stain should I use — water, spirit or oil-based?
The carrier decides how a stain behaves under your brush. What each does to the grain, how long each gives you to work, and what will go on top of it afterwards.
intermediate12 min4 min readWhy can I see every bump and joint through my vinyl floor?
Telegraphing is the subfloor showing through a thin covering, and it does not settle out — it deepens. What causes each pattern, and why the fix is always underneath.
intermediate2 hr3 min readWhy can I see my filled repairs through the paint?
Flashing — the dull patch over a repair — is a suction problem, not a coverage problem, and one more topcoat will not cure it.
beginner1 hr4 min readWhy did I get mould after having new double glazing fitted?
Why replacing draughty windows moves condensation from the glass onto the walls, and the ventilation that has to be added back to compensate.
beginner30 min3 min readWhy did my new bathroom sealant go black within weeks?
The five reasons a fresh bead colonises almost immediately — a contaminated substrate, the wrong sealant, a joint sealed damp, standing water and a room that never dries.
beginner20 min4 min readWhy did my superglue not stick?
Six specific causes, each with its own symptom: too thick, too old, too dry, the wrong plastic, a contaminated surface, or the wrong load on a brittle adhesive.
beginner15 min5 min readWhy do my screws split the wood near the end of a board?
The wedge effect of a screw in end grain, and the clearance hole, pilot hole and edge distance that prevent it.
beginner12 min3 min readWhy do the joints between my coving lengths keep cracking?
Butt joints between coving lengths crack because the joint is rigid and the wall is not. Bonding the joint properly and filling it flexibly is what keeps it closed.
intermediate45 min3 min readWhy does my burglar alarm keep going off, and how do I silence it?
The five things that cause almost every false alarm, how to stop one that is already sounding, and the sensor faults worth checking before calling anyone.
beginner1 hr5 min readWhy does my exterior woodwork always fail at the bottom?
Every cut end in a frame is a bundle of open tubes that wicks water many times faster than a painted face. Why failure always starts there, and the maintenance that follows from it.
intermediate1 hr 30 min5 min readWhy does my oven fan make a noise?
Four distinct oven fan noises, what each one means, and which of them is a five-minute fix rather than an engineer.
beginner20 min4 min readWhy does my saw keep binding and jamming in the cut?
The kerf closing on the blade is the cause almost every time. Why it closes, the four ways to stop it, and the difference between binding in a hand saw and binding in a powered one.
beginner15 min4 min readWhy does my water pressure drop when someone else runs a tap?
What simultaneous demand actually does to a plumbing system, why some houses cope and others don't, and the fixes that work at each point in the chain.
beginner15 min4 min readWhy does the crack in my plaster wall keep coming back?
Reading a crack to work out what is moving, the difference between a joint and a fault, and the repairs that hold versus the ones that reopen.
intermediate1 hr4 min readWhy does water sit in my shower tray instead of draining?
Telling a slow waste from a tray that no longer falls to the outlet, and why the second one is a bedding problem rather than a blockage.
beginner45 min3 min read
Going deeper: MaterialWorld
Material properties, comparisons and suitability — paints, fillers, sealants, timber, tile, insulation.
MaterialWorld is in development — GuideHQ covers the practical answers in the meantime.