Anyone who has framed through a Vancouver Island winter knows the pattern: a stretch of wet days, plywood swelling on the deck, a crew standing around, and a schedule that quietly slips a week. Panelized framing is often pitched as the cure. It is a partial one, and the honest version of the argument is more useful to a builder than the sales version.
Where the Exposure Actually Is
On a site-framed building, the structure is open to weather for the whole time it takes the crew to frame the walls, floors and roof and get the building dried in. Lumber, sheathing and subfloor sit in the rain, and any day that is too wet or windy to work is a day with no progress.
With panelized framing, the wall assembly happens inside a shop. Panels then arrive on site and are stood, braced and tied together, which shortens the window during which wall framing is exposed. The exposure that remains is real: panels still travel on a truck, still sit during a crane lift, and the building is still open until the roof is on and the envelope is closed in.
What Changes in Your Schedule
| Schedule item | Site-framed | Panelized |
|---|---|---|
| Wall framing | On site, weather-dependent every day | In the shop, then a shorter stand on site |
| Foundation overlap | Framing waits for the foundation | Panels are built while the foundation is built |
| Delivery and crane day | Not required for walls | A fixed day that is itself weather-sensitive |
| Material exposure | Wall lumber and sheathing exposed during framing | Panels exposed during transport, lift and until dried in |
| Rework from site errors | Handled as the crew goes | Caught at layout review, costly after fabrication |
Notice what moves: the risk is concentrated into fewer, more critical events. That is a good trade if you plan for it, and a bad one if you do not.
Plan Float With Your Own Numbers
We do not offer a standard percentage of days lost to weather. It depends on the month, the site, the crew, and on how much risk you are willing to carry. Instead, use a simple method:
- 1Estimate the working days your walls will be exposed under each method, from your own crew or supplier.
- 2Pick a share of those days you will assume are lost to weather in the season you are framing. Use your own history from past jobs.
- 3Multiply to get expected lost days for each method.
- 4Compare the result with the float you have before the next trade needs the building closed in.
The construction schedule float planner does exactly this arithmetic with the inputs you enter. If you also want to attach your own cost per day, the rain delay cost calculator does that part. Neither tool forecasts weather, and neither tells you what a delay will cost beyond the figure you type in.
What to Ask a Panel Supplier
- ✓How many on-site days do they expect for the wall stand on your building?
- ✓What is their plan if the delivery day is rained out or too windy to lift?
- ✓Can panels be wrapped or covered during storage and transit?
- ✓How early before delivery do they need a firm foundation completion date?
- ✓What is the schedule from layout approval to delivery? Ask for dates on your drawings rather than a general rule.
Fabrication lead time is a schedule item too. The shop days that replace site framing days only help if the panels are ready when the foundation is. Float planning should include both, not just the on-site portion.
Dry-In Is the Real Target
The date that matters for the rest of the building is not when walls are up but when the building is closed in, with roof, wall wrap and windows or temporary protection. Plan the whole sequence backwards from that date and decide where you want your float to sit. Our overview of how fast prefab construction is covers the sequence in more detail.
Frequently Asked Questions
Does panelized framing eliminate weather delays?
No. It moves wall assembly into a shop and shortens the time walls are being framed on site, but delivery, the crane lift, roof framing and drying-in are still exposed to weather.
What percentage of days should I assume are lost to rain?
There is no single honest number. Use your own records from similar jobs in the same season, and treat the number as an assumption you can adjust.
Is a rained-out crane day a big problem?
It can be, because crane and crew are booked together. Ask your supplier and crane operator how they reschedule, and keep float in the schedule for it.
Should I panelize if I am framing in winter?
It can help reduce the time the wall framing is exposed, but it is a decision to make with your supplier on your actual project, including lead time and delivery conditions.
Where do I start?
Run both methods through the float planner with your own numbers, then talk to the supplier about dates for your drawings.
Want to talk through schedule for a specific set of plans? Send us the drawings and we will respond with questions and next steps.
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