Cottage Closing Checklist for the Crawl Space and Foundation

When you close a cottage for the season, the part of the building that suffers most while you are gone is the part you see least: the crawl space and whatever the cottage sits on. Before you lock up, walk the perimeter, look at every pier or post, check the crawl space for water and animals, get roof and surface water moving away from the footings, and photograph anything that looks off so you can compare in spring. An unheated building on piers or a shallow foundation goes through months of freeze and thaw with nobody there to notice a problem early.

This checklist is written for seasonal cottages, cabins and camps in cold climates, whether the building sits on concrete piers, wood posts, a block perimeter wall or a short poured foundation with a crawl space.

Why cottages need their own list

A house lived in all winter is heated, watched and shovelled. A closed cottage gets none of that. The crawl space gets as cold as the outside air, so frost can reach deeper under the footings. Many older cottages were built on piers that sit on rock, on a shallow pad or on soil that holds water, and some were never designed for frost at all. Meltwater in spring often runs toward the lake, which can mean right under the building. Small issues have five or six months to get worse before anyone checks.

Walk the outside first

Gutters, downspouts and roof runoff

Clear the gutters and make sure every downspout discharges at least 6 feet (about 2 metres) away, onto ground that slopes away. Many cottages have no gutters at all, which means a line of water falling off the eaves straight onto the soil around the piers. If that is your situation, look at where the drip line is and whether the ground there is washing out or staying soggy.

Grading and drainage paths

The soil around the building should fall away from it, not toward it. On a lakefront or hillside lot, look at the uphill side: is runoff from the slope above being directed around the cottage, or straight under it? A shallow swale or a short section of drain on the uphill side can do more for a cottage foundation than any repair underneath.

Skirting and access openings

If the crawl space is enclosed with skirting or lattice, check that it is intact and that the access door closes properly. Gaps are how raccoons, porcupines, skunks and mice get in for the winter, and animals in a crawl space tear up insulation and vapour barriers. Do not seal off every opening without knowing how the crawl space is meant to breathe (more on that below).

Under the cottage: piers, posts and walls

Bring a flashlight and photograph each support from the same angle, dated, so you can compare in spring.

Piers and posts

• Look for piers that have tilted, cracked, or shifted off their footing pad.
• Check that every beam is actually resting on its pier. A gap between the top of a post and the beam means something has moved.
• Look at shims. Stacks of wood shims, stones or bricks are common under older cottages and tend to crush or slide over time.
• On wood posts, push a screwdriver into the base. Soft, punky wood at ground level is rot, and that support needs attention.
• Note any steel jack posts. They are often installed as a temporary fix and then forgotten for years.

Block or poured perimeter walls

• Mark the ends of any crack with a pencil and the date, so you will know in spring whether it grew.
• Look for horizontal cracks or a wall that leans inward. Those point to soil and frost pressure, not just shrinkage.
• Check for white mineral deposits (efflorescence) or water stains, which show where water comes through.

If you are unsure which cracks matter, our guide to cosmetic vs structural foundation cracks walks through the patterns to watch.

Signs the building is moving

Inside, look for doors that stick, windows that bind, sloping floors and diagonal drywall cracks from window or door corners. One alone may be seasonal; several new ones together usually mean a support has settled or heaved.

Moisture in the crawl space

Standing water and wet soil

Note whether there is standing water, wet soil or puddles in low spots. A crawl space that is wet in October will almost certainly be wetter in April. Look for a pattern: water on one side only usually traces back to roof runoff or grading on that side.

Vapour barrier and insulation

Check that the ground cover (the plastic sheet on the soil) is intact and lapped at the seams, and that insulation in the floor joists has not fallen down or soaked up water. Sagging, wet insulation is a sign of a moisture problem, not just a loose batt.

Vents: open or closed

Traditional vented crawl spaces were designed to have their vents open, but in a building that is closed and unheated, the right approach depends on how the space is built. A sealed or encapsulated crawl space is designed with the vents permanently closed. If you are not sure what you have, leave the setup the way it was designed and ask a specialist rather than improvising, because closing vents on a damp, unsealed crawl space can trap moisture all winter.

When a crawl space is damp every year, crawl space encapsulation is often the long-term fix. It seals the ground and walls with a heavy liner and controls humidity, which also protects the floor framing above.

Plumbing and water lines

A burst line in a crawl space can soak the soil under the footings and become a foundation problem. Drain and shut off the system the way your cottage is set up to be winterized, and check that any line that stays charged is insulated or heat-traced. The spot where the water line enters the crawl space is a common place for both freezing and animal entry.

When to have a specialist look first

Some findings are worth an inspection before winter rather than after it:

• A pier or post that has visibly tilted or lifted off its base
• A gap between a beam and its support
• A horizontal crack or a wall leaning inward
• Doors and floors that changed noticeably since spring
• Standing water in the crawl space every fall

Fixes range from re-levelling and replacing individual supports to new footings below the frost line or underpinning with piers when the original supports sit on poor soil. Exterior drainage work and anything involving excavation is far easier before the ground freezes.

Frequently asked questions

Do cottages on piers suffer from frost heave?

Yes, especially when the piers sit on soil above the frost line rather than on bedrock or deep footings. Water in the soil under a shallow pier freezes, expands and pushes the pier up, then lets it drop unevenly in spring. Over several winters that can leave the floor out of level and supports no longer bearing on the beams.

Should crawl space vents be closed when closing a cottage?

It depends on how the crawl space was built. A sealed or encapsulated crawl space keeps its vents closed by design, while a traditional vented crawl space with bare soil and no humidity control can trap moisture if you seal it. When in doubt, keep the original setup and have the space assessed before changing it.

Can a cottage crawl space repair wait until spring?

Minor issues such as a loose vapour barrier or a small hairline crack can usually wait. A support that has moved, standing water, or a wall that is leaning should be looked at before winter, because frost and the spring melt tend to make those worse. Exterior drainage and footing work is also much harder once the ground is frozen.

How can you tell if a cottage is settling or heaving?

Settling usually shows up as floors sloping toward one support, cracks that widen at the top, and doors that drift out of square. Heaving tends to appear after winter, with a pier or post pushed up, a gap opening under a beam elsewhere, and doors that bind in spring and ease off by summer. Dated photos taken at closing and opening make the difference easy to see.

Get a written quote before the season ends

If your closing walk-through turned up moving piers, a wet crawl space or new cracks, send us the details and a few photos. We match you with a foundation specialist in your area, who finds the cause and puts the fix in a written quote, so you know what you are dealing with before the snow arrives.