Coordinating Parallel Finishing Trades Without Losing Weeks

Why do finishing works feel chaotic compared to the structure phase?

The structural phase of a Thai SME project runs one trade at a time: concrete, rebar, and masonry follow each other in a clear sequence. Finishing works are different. In the final four to eight weeks before handover, electrical second-fix, plumbing second-fix, tile laying, wall plastering, painting, and joinery trim installations all compete for the same rooms on the same days. Each trade depends on the previous one finishing a specific area, but in practice they chase each other through the building instead of following an agreed sequence. The result is constant re-touching — fresh paint scuffed by a tiler's bucket, grouting cracked by an electrician's drill — which turns a planned six-week finishing phase into nine weeks without anyone making a single decision to let it happen.

What is the correct sequence for finishing works on a typical Thai residential floor?

The sequence that prevents re-work follows a top-down, rough-to-fine principle. On any given floor, ceiling MEP rough-in and system testing come first. Once ceilings are signed off, gypsum board or plaster ceilings close them in. Wall plastering follows, then floor tiles are laid from the centre of the room outward. Only after floor tiles are fully cured and protected with cardboard should the electrician and plumber return for second-fix outlets, switches, and sanitary fittings. Painting comes after second-fix, except for ceiling coats applied before wall tiles in bathrooms where tile splatter would damage finishes above. Timber skirting, door liners, and built-in joinery are always last — the final items in each room before inspection. Deviating from this order costs time, it does not save it.

How do you model a multi-trade finishing sequence in SiteBoard's Gantt planning view?

Open SiteBoard's Gantt planning view and create one task per trade per floor or zone — for example, "Floor 2 — tile laying," "Floor 2 — second-fix electrical," "Floor 2 — painting." Set task dependencies so second-fix electrical can only start after tile laying is marked complete on that floor. This forces the Gantt to surface any slip in tile work immediately as a downstream delay on all dependent trades, rather than discovering the clash on site the morning a second trade arrives expecting to begin. Break durations to realistic lengths: a three-bedroom floor of 120 square metres typically needs one tiling team four to five working days, followed by two days of cure and protection before the electrician enters. This level of planning takes about thirty minutes at the start of the finishing phase and prevents many hours of re-work coordination later.

A worked example: finishing six floors in a Nonthaburi condominium block on schedule

A contractor managing a six-floor, twenty-four-unit condominium block in Nonthaburi used a zone-by-zone approach that became standard practice for their company. Instead of letting each trade work across all six floors before the next trade started, the programme divided the block into two zones of three floors each, with Zone A running four weeks ahead of Zone B on a staggered schedule. The tile team finished floor 1 on Monday; the electrician entered floor 1 on Thursday after two days of cure and protection. By the time Zone A reached painting, Zone B was still in tiling, and each trade moved continuously without stopping between floors. The finishing phase completed five days ahead of the planned forty-two working days, and retouching costs came to under 15,000 baht for the whole block — roughly one-quarter of the 60,000-baht re-work budget the contractor had originally allowed.

How do on-site progress updates help when a trade leaves a room half-finished?

In any finishing phase there will be moments when a trade leaves a room partially complete — a tile setter who runs short of a batch before grouting the final corner, or an electrician who finishes all outlets but leaves one light fitting for a return visit. These half-finished states are invisible to the next trade unless someone records them. Use SiteBoard's on-site progress updates to log the exact percentage complete and a photo of the outstanding area each time a trade exits a room. The incoming trade checks the update before entering and knows exactly what is and is not done. This two-minute habit prevents the most common finishing-phase dispute: whether the previous trade cleared their work before the next one started — a question that is unanswerable without a timestamped photo record to refer back to.

What should you do when a subcontractor's trade slips and threatens to delay the whole zone?

A tiling subcontractor who runs two days late on one floor is not just a two-day problem. If electrical second-fix cannot enter until tiling is done, and painting cannot start until electrical is done, the slip compounds across three trades. The moment you see a task in SiteBoard's Gantt running behind its planned finish date, adjust the dependent tasks so the revised impact is visible immediately rather than discovered at end of week from a verbal report. Then contact the delayed trade the same day: can they add a second team for two days to recover, or will the downstream delay cascade? Log the outcome as a task note. A two-day slip caught on day one is recoverable; the same slip discovered on day five, when two other trades are already standing by, costs three to four times as much in standby time and rescheduling.

How can the owner sharing link reduce last-minute pressure during the finishing rush?

Owners visiting a site in the final weeks often see incomplete rooms and assume the project is further behind than the numbers actually show. One room still in bare plaster looks alarming if the owner does not know that the next three rooms are already tiled and painted. Sharing SiteBoard's owner sharing link with a per-floor, per-zone breakdown gives the owner a factual picture: zone A is 90 percent complete, zone B is 65 percent complete, and the overall programme shows handover is still on track. Owners who can see the real schedule — not only what they observe when they walk the site — ask fewer panic questions and make fewer demands to add workers and accelerate, which in the finishing phase almost always creates more re-work than progress.

FAQ: How long should you wait between tile grouting and the next trade entering the room?

Tile grout in Thai site conditions needs at least 24 hours before light foot traffic and 48 to 72 hours before heavy tool-carrying trades such as electricians or plumbers return. Epoxy grout requires a full 72 hours before it reaches working strength in humid conditions. The practical rule on most Thai residential sites is: tile and grout Monday and Tuesday, protect the floor with cardboard on Wednesday, allow the next trade to enter from Thursday. For bathroom wet areas finished with silicone sealant, allow a full 24 hours after application before any water testing. Log these cure-period tasks explicitly in SiteBoard's Gantt planning view as short tasks labelled "cure and protect — no entry" so no supervisor inadvertently schedules a trade into the room before the waiting period is complete.

FAQ: When the painter and the tile setter both need the same room on the same day, who yields?

In any sequencing conflict between painting and tile setting, tile laying always takes priority. Tile adhesive and grout are messier than paint, require a clean dry surface to bond correctly, and cannot be applied over fresh paint without adhesion failure. The rule is: tile first, then paint. The only exception is ceiling paint applied before wall tiles in a bathroom with a full-height tile finish, where the painter applies the ceiling coat and waits 24 hours before the tiler begins wall tiles. If the painter arrives expecting to start walls on a day when the tile team has not yet cleared, redirect the painter to another zone or room that is genuinely ready — the zone-by-zone breakdown in SiteBoard's Gantt planning view shows at a glance which rooms are in which state and avoids sending the wrong trade to the wrong place.

FAQ: How do I record a trade handoff so there is no dispute later about who left what undone?

A trade handoff record is a short note and a photo taken at the moment one trade leaves a room and before the next enters. In SiteBoard, this is a single on-site progress update: set the outgoing trade's task to its actual percentage complete, take a photo showing the state of the room, and write a one-line note — for example, "tiling complete except northeast corner 2 sq m, grouting done, protective cardboard laid." When the incoming trade later reports a problem — a scratched tile or a missing outlet backing box — scroll back to the handoff update and confirm exactly what the room looked like at that moment. This matters most in multi-unit or multi-floor projects where different subcontractor teams overlap and there is a temptation to blame whichever trade worked in the room before them.