Humidity costs more than snow on a fitness center roof, and most owners price it backwards. A pool deck, a hot yoga room and a locker area all push warm, wet air up into the roof assembly, where it meets a cold deck and condenses. The 60 psf design snow load sits on top of that. Send us the plans and the sheet. We return a priced scope that treats the vapor layer and the snow load as separate lines, so the owner can see what each one costs.
The call: price the vapor control layer as its own line
Inside a gym, the roof sees moisture from showers, pools, steam rooms and people breathing hard for an hour. Warm air carries that moisture upward. Where it meets a cold surface, it condenses, soaks the insulation and rusts the deck. A new membrane laid over wet insulation shortens its own life.
Pool hall air is also corrosive. Chloramines and chlorine vapor attack steel fasteners, deck panels and any exposed metal in the roof assembly. Stainless or coated fasteners, a sealed deck underside and a stainless or coated edge detail cost more at install and last years longer. They belong in the base for any wet room, not in the alternates, and we name the fastener coating in the bid, because the failure shows up in year four and the repair means opening the roof over the water.
So the vapor control layer, the air seal at the deck and the insulation thickness get their own lines in the bid. Skip them to save money and the roof looks fine for a year, then drips. A core and a moisture survey before the bid tell us whether the existing insulation is wet and how far the moisture runs.
What it costs: big units, tall ceilings and night work
Fitness buildings carry large rooftop units that serve open floors and pool halls, and they are heavy and expensive to lift. Each one is a curb to rebuild and a shutdown to schedule. Tall ceilings make interior protection harder, since scaffolding or lifts are needed under open sections.
Members expect the building open early and late. Noisy tear-off moves to mid-day or to a closure day, and the owner decides what is acceptable. Price the shutdown windows, the interior protection and the crane lift for the largest unit as separate lines. A manager comparing two bids should see the same lines in both, or the low number is hiding something.
Noise carries through a light deck into a quiet room, and a yoga studio or a childcare area below needs a different schedule than a free-weight floor. We ask the manager which rooms are noise-sensitive and when classes run. We schedule the loudest work, tear-off and fastener driving, over the least sensitive rooms and the quietest hours, and we list the answers in the schedule so instructors and members hear about it ahead of time.
What the code sheet says: 60 psf, 115 mph and required ice barrier
The city sheet rates weathering as severe and requires ice barrier underlayment at eaves. Idaho enforces the 2018 International Building Code and Energy Conservation Code statewide. The energy code matters for a gym because insulation thickness and air sealing are part of what the city checks.
Long, open spans carry snow with little reserve, and a stepped roofline traps it, and wet snow is dense. A recover layer adds weight, so the framing is checked first. A gym roof with a high clerestory or a stepped profile also collects drifts on the lower level, which is where we look for sag and ponding.
Where it fails first: pool hall roofs, curbs and the stepped roof
Pool hall roofs fail first, from the inside out. Fasteners rust, insulation soaks and the deck stains. Rooftop-unit curbs come next, since the units are heavy and vibrate. Then the step between a high roof and a low one, where drifts load the lower roof and meltwater runs into the wall flashing.
A stain on a locker room ceiling could be roof water or condensation. A moisture reading and a hose test tell the two apart. We find the source before we price a fix, since an infrared moisture survey costs less than replacing a dry roof. If the cause is condensation, the answer is insulation and ventilation, and no amount of sealant on top will help. Patching a pool-hall roof three times for what turns out to be a missing vapor layer costs more than the layer would have.
Alternates: PVC over the pool hall, cover board and more insulation
A welded PVC roofing sheet resists many of the chemicals that reach pool-hall roofs and welds at the seams. A cover board resists hail and foot traffic. More insulation, specified through roof insulation and cover board, lowers heating cost and keeps the deck warmer than the dew point.
Each is a priced alternate with a tradeoff. We name what we would buy. A city rec center answers to a board, the way any government building does, and a gym with a pool shares its vapor problem with a hotel, where guests and a pool share a roof.
Schedule and snow window: spring tear-off, fall check
The dry window is short here, so a fitness center that wants a June start books in winter. For a location in Post Falls or near Riverstone, crew and material lock at the contract date. Open edges get tied down every shift, because one gust under a loose edge can peel a section.
Hold points keep the work checkable. We stop for an owner or inspector sign-off after the deck is exposed and the moisture is mapped, again after the vapor layer and insulation go down and again after the flashings. Each hold costs a few hours. Each one catches the defect that would otherwise be buried under the membrane for the next twenty years, and each is dated in the schedule so a delay is visible the day it happens.
Closeout: moisture readings and a drain check
The owner receives photographs, the moisture results, a punch list and a roof diagram that marks where the vapor layer was sealed around each pipe and curb, which is the detail a later roofer needs before cutting anywhere near the pool hall. A fall visit clears drains and checks unit curbs. A spring visit checks for ice damage and condensation stains. That is how a roof stays dry between replacements. For a facility in Riverstone or out on the Prairie, the schedule is the same: two visits a year, one set of photographs, one running list of what changed.
Commercial Roofing Questions
Why does my pool hall roof drip in winter?
Warm, wet air condenses on the cold deck. The fix is a vapor control layer, air sealing and insulation, not sealant on top.
Can the gym stay open during a reroof?
Mostly. We phase the work, protect the interior and move noisy tear-off to low-use hours or a closure day. Interior protection goes up before the first panel comes off.
Is PVC better over a pool hall?
Often. It resists many chemicals and welds at the seams. The vapor layer under it matters just as much.
How do we tell condensation from a roof leak?
A moisture reading and a hose test. Water that shows up on cold mornings and never after rain points to condensation.
What does the framing check involve?
We look at beams, connections and the deck underside for sag or cracks, then compare the added weight to the 60 psf snow load. An engineer reviews anything that looks stressed before a recover is priced.