Quick Answer: Curling stones are porous granite: let them sit wet through freeze-thaw cycles and the stone itself can crack. That is why the documented off-season spec is dry storage, rocks upside-down resting on their handles, and it is why a dehumidified container beats the damp corner of an arena the club rents but does not control. Van Blanc supplies clubs across Ontario from Brantford.
Can Granite Actually Be Ruined by a Damp Summer?
It surprises people outside the sport, but yes. A curling stone reads as indestructible, 18 to 20 kilograms of granite, yet the stone is porous, and ice-maker references like CurlTech’s rock guidance treat moisture as a real enemy: water that soaks into the stone and then freezes expands, and repeated freeze-thaw in a wet stone can crack granite that costs a club serious money to replace, which is why the off-season prescription is unglamorous and absolute: store them dry. The second half of the spec, repeated in club FAQs like Dakota Curling’s, is to store rocks upside-down so they rest on their handles, keeping the precious running surface, the narrow ring of stone that actually touches the ice, away from anything that could nick or contaminate it.
So the summer question for every club is where “dry” actually exists. And for clubs curling in rented arena time or aging quonsets, the honest answer is often: nowhere they control.
The Rest of the Club Lives in the Same Corner
The rocks are the crown jewels, but a curling club’s off-season pile runs deeper: hacks and hog-line sensor units with batteries that hate heat swings, measuring devices, club brushes and rental sliders, scoreboards, sponsor signage, the lounge’s overflow, and the bonspiel kit (trophies, banners, the kitchen’s roasters) that surfaces twice a year. In a shared arena, all of it lives wherever the landlord tolerates it, which is usually the dampest corner of the building, and clubs that have lost a season’s rental brooms to mildew know how that story ends.
Handles Off, Tagged, and Boxed
Clubs that pull handles for maintenance over summer should bag and tag hardware per stone. A shelf in the container with one labelled bin per sheet turns fall reassembly from an afternoon of guessing into an hour of bolting.
A Dry Room the Club Owns
A 20ft container behind the rink is the club-owned answer: corten steel, one gasketed door, and the moisture discipline this decision actually needs. Passive vents plus desiccant handle most Ontario summers; clubs near water or with a history of damp add a small plug-in dehumidifier on a simple hookup and hold the interior where porous granite wants to live. Rocks go on a low, sturdy shelf or pallet, upside-down on their handles per the spec, weight spread across the 28mm hardwood floor that shrugs at a few tonnes of granite. Everything else racks above and beside them, and the club stops negotiating with a landlord for the damp corner.
Christian LeBlanc, second-generation operator: “A club treasurer told me the math that closed it: they priced replacing a single sheet of matched rocks after two cracked, and the container cost less than the rocks did. Everything after that conversation was just picking the delivery date.”
The Rocks Cost More Than the Room That Protects Them
One matched sheet of stones is worth more than the container that keeps every sheet dry. Call with the club’s inventory and we will size the dry room honestly.
Club Logistics: Volunteers, Budgets, and One Key
Curling clubs run on volunteers and AGM-approved budgets, and the container suits both. It is a one-time capital line a board can vote on, not a rent negotiation that reopens yearly; the key list is the executive plus the ice tech; and delivery is one tilt-deck visit to the rink’s back apron, 1-3 days out from our Brantford yards for most of Ontario. A Wind and Watertight grade does the job; clubs who want the branding pick a repaint in club colours and let the sponsors’ logos ride the side that faces the parking lot. It is the same one-locked-room logic our community organization page walks through, tuned for the one sport whose equipment can be killed by humidity while looking like it could survive a war.
Frequently Asked Questions
How should curling rocks be stored in the off-season?
Dry, and upside-down resting on their handles so the running surface touches nothing. Porous granite that sits wet through freeze-thaw cycles can crack, so the storage spec is really a humidity spec: vents and desiccant at minimum, a small dehumidifier for damp sites.
Can a container floor take a full set of curling stones?
Easily. A sheet’s worth of stones is under 350 kg and a full club set a few tonnes spread across pallets, well inside what the 28mm marine-ply floor over steel cross-members carries every day in freight service.
Do we need power for a curling club container?
Only if the site is damp. Most Ontario locations hold fine on passive vents and desiccant; clubs near water or with a mildew history run a small plug-in dehumidifier from the rink’s exterior outlet and settle the question permanently.
What size container does a curling club need?
A 20ft handles most clubs: rocks low on pallets or shelving, brushes, hacks, sensors, and bonspiel kit racked above. Clubs storing lounge furniture or large signage step to a 40ft. Send the inventory list and we will size it honestly.
Sources
- CurlTech. Ice and rock care references for curling facilities. curltech.com
- Dakota Curling Supplies. Curling equipment care FAQ. dakotacurling.supplies
- International Organization for Standardization. ISO 668, Series 1 freight containers, classification, dimensions and ratings. iso.org
Reach Van Blanc in Brantford
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Club executives: bring the inventory list to the call. The dry room is a one-vote fix.
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