I want to soundproof my master bedroom from the kids' playroom next door, where do I start?

Starting a bedroom soundproofing project comes down to one foundational principle: sound travels through every connected path simultaneously, so you need to address the shared wall, the door, any HVAC connections, and the ceiling or floor if the rooms are stacked. The good news is that a master bedroom and adjacent playroom is one of the most common and solvable soundproofing scenarios in Ottawa homes.

Diagnose Before You Build

Before spending a dollar on materials, spend an hour understanding exactly how sound is getting through. Close the door, have someone play in the playroom at normal volume, and walk slowly around your bedroom pressing your ear near the wall, door frame, electrical outlets, and any HVAC vents. You will almost certainly find that the door is the biggest offender — most interior doors in Ottawa homes are hollow-core with visible gaps at the bottom and sides, and they offer almost no sound resistance on their own.

The shared wall is your next priority. Standard construction in most Barrhaven, Kanata, or Nepean homes built after 1990 uses 2x4 stud framing with standard fibreglass batts — an assembly that typically achieves only STC 33 to 38, meaning you can clearly hear speech and children playing. The Ontario Building Code's STC 50 minimum applies to party walls between separate dwelling units, not interior walls within a single home, so builders have little incentive to do better than the minimum for interior partitions.

The most effective upgrade path for a shared interior wall is to add resilient channel or sound isolation clips (such as RSIC-1 clips with hat channel), replace any existing fibreglass insulation with Roxul Safe'n'Sound acoustic mineral wool, and apply two layers of 5/8-inch Type X drywall with Green Glue Noiseproofing Compound sandwiched between them. This assembly, properly executed, can push your wall to STC 52 to 58 — a dramatic real-world improvement. Expect to pay $15 to $25 per square foot installed for this type of upgrade in Ottawa's current market, or roughly $2,500 to $4,500 for a typical shared wall.

Do not skip the door. A solid-core door with proper weatherstripping and a door sweep can add 10 to 15 STC points compared to a hollow-core door with gaps. This is the single highest-value upgrade per dollar in most bedroom situations, often costing $400 to $900 installed and making an immediately noticeable difference.

HVAC ducts are a hidden flanking path that homeowners consistently overlook. If both rooms share a forced-air duct system — which most Ottawa homes do — sound travels freely through the ductwork. A qualified contractor can add duct liner insulation or install a sound baffle in the duct run to reduce this transmission.

From a practical standpoint, schedule any wall work for late spring through early fall if possible. Green Glue compound needs temperatures above 10°C to cure properly, and working in an unheated space during an Ottawa winter requires temporary heating equipment that adds cost and complexity. Also, when your contractor opens the wall, have them check vapour barrier placement — in Ottawa's climate, the barrier must be on the warm side of the insulation, and it is common to find it missing or incorrectly placed in older homes.

The most important thing to avoid is treating this as a single-product problem. Acoustic foam panels, for example, will do nothing to block sound transmission from a playroom — they only absorb echo within a room. Effective soundproofing is always a systems approach: mass, decoupling, absorption, and sealing working together.

For a project like this, it is genuinely worth having an experienced soundproofing contractor walk through both rooms before you commit to a scope of work — they can identify flanking paths you might miss and recommend the most cost-effective combination of upgrades for your specific home. You can find soundproofing professionals serving the Ottawa area through the Ottawa Contractor Directory at justynrookcontracting.com/directory.