Basement Remodeling

Water first: reading a Massachusetts foundation

Before anyone talks about finishes, we spend time in the basement with a flashlight. Older Massachusetts houses sit on fieldstone or rubble foundations laid up with mortar that has been washing out for a century. Mid-century houses tend to have block, which leaks at the joints and through the cores. Poured concrete in newer houses does better but still cracks. Each one lets water in differently, and each one needs its own plan.

We look for efflorescence, the white crust left when water passes through masonry, for stains at the base of the walls, rust on the bottoms of the steel columns and the line a past flood left on the stair stringers. We ask where the gutters drain, whether the yard slopes toward the house, and what happened in the last heavy spring rain. Many wet basements are fixed outside first: downspouts carried away from the house, grading corrected, a window well cleaned out and covered.

If water is getting in, we tell you before we talk about finishes. Finishing over a wet wall only hides the problem until the drywall starts to grow something.

Radon is the other thing worth knowing about below grade. It shows up in some Massachusetts basements, and a simple test before the walls close tells you whether a mitigation system belongs in the plan.

Sump, drainage and keeping the floor dry

When the outside fixes are not enough, the usual answer is an interior perimeter drain: a channel cut along the base of the walls, perforated pipe set in stone, and a sump pit with a pump that sends the water outside and away from the foundation. A battery backup on the pump is worth considering, because the storm that knocks the power out is the same storm that raises the water table.

The slab in many older basements is thin, cracked or missing in places. We look at whether it needs patching, a new topping or replacement before a finished floor goes down. Either way the finished floor has to tolerate some moisture, which rules out a few materials and favors others, and we go through those options with you.

On fieldstone walls we often hang a dimpled drainage membrane against the stone, draining down to the perimeter system, before any framing goes up in front of it. That gives any water a path that does not run through your new walls.

We measure all of it on the walkthrough and tell you plainly what the room will feel like when you stand in it.

Insulation, framing and the stretch energy code

Once the space is dry, the walls get insulated. In a basement the insulation has to keep the warm, damp air of the house away from the cold foundation, or condensation forms behind the wall. Rigid foam or closed-cell spray foam against the foundation, then a framed wall in front of it, is the common approach. Fiberglass batts pressed against a concrete wall are a common mistake in older finished basements, because they hold moisture against the foundation.

Many Massachusetts towns have adopted the stretch energy code, and insulation and air sealing for a newly finished basement follow whichever code your town has in place. The building department inspects framing and insulation before any drywall goes up.

Framing uses pressure-treated bottom plates against the slab, and we keep the walls off the foundation itself. Licensed electricians run the new circuits, smoke and carbon monoxide alarms go in where code calls for them, and if a bathroom is part of the plan, a licensed plumber works out whether the drains can run by gravity or need an ejector pump.

Ducts, beams and the ceiling height you have

Basement ceilings are crowded. Heating ducts, a main beam, a drain line running the length of the house and the water supply all hang below the joists. The finished ceiling height is set by the lowest of those, and code has minimums for habitable rooms. We measure all of it on the walkthrough and tell you plainly what the room will feel like when you stand in it.

There are ways to win back height: rerouting a duct into a joist bay, relocating a drain, or boxing in only the beam and leaving the rest of the ceiling at full height. Some of them are worth it and some are not. A suspended ceiling keeps access to valves and cleanouts, while drywall looks better but needs access panels in the right places. We show you both and let you choose.

Lally columns in the middle of a room are another common question. Sometimes they can be relocated into a wall line or replaced with a longer beam, which is structural work with a permit, and sometimes the better answer is to wrap them as part of the design.

The furnace, water heater and electrical panel need clearance and access. We lay out the mechanical room first and build the finished rooms around it.

Bedrooms below grade, egress and how the job runs

A basement bedroom needs an egress window or door large enough to climb out of in a fire, with a window well you can get up and out of. That means cutting the foundation, which is structural work with a permit. If your house is on a septic system, adding a bedroom also brings a Title 5 review of the system's design flow, which can decide whether a basement room may be called a bedroom at all. We raise both early so they do not surprise you late.

Basement work is messy, and the only way in is usually through the house. We cover the path from the door to the stairs, put dust barriers at the top of the stairs and clean up at the end of each day. Steve keeps you informed as the job goes, with a weekly update and a call the same day if the foundation shows us something new. Changes are written down before they are built.

When the work is done, the space gets cleaned top to bottom, the sump is tested in front of you, and you get a walkthrough of where the cleanouts, shutoffs and access panels are so you know your own basement. Finished space below grade is only worth having if it stays dry, and that is the standard we hold the job to.

See the rest of our remodeling work, or browse the gallery for rooms we have finished.