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Historic Restoration · Lake Bluff, IL

Pre-Listing Foundation Remediation - 1906 Shingle Style

April 14, 2024 | East Lake Bluff lakefront residential area

Historic masonry restoration in Lake Bluff, IL follows NPS Preservation Brief 2 standards, using lime-based mortar matched to pre-1940 originals and salvaged or custom-fired brick to preserve period-correct appearance on 1906 Shingle Style with brick foundation structures.

Before: Lake Bluff 1906 Shingle Style with brick foundation completed work by Delta Masonry Before
After: Lake Bluff 1906 Shingle Style with brick foundation completed work by Delta Masonry After
Scope Full perimeter repointing of an exposed brick foundation on a 1906 Shingle Style home. Repair of two sections of displaced foundation brick. Mortar wash repair at sill plate junctions. Written condition report for real estate transaction file.
Mortar Type NHL 3.5 natural hydraulic lime
Duration 2 days
Building 1906 Shingle Style with brick foundation
Neighborhood East Lake Bluff
Common brick stock Standard residential brick with some older soft brick
Weather exposure Moderate
County Lake County
From our shop 5 miles

The Problem

A real estate agent representing the sellers of a 1906 Shingle Style home in East Lake Bluff contacted us directly. The home was going to market in six weeks and the agent had previewed the property. The exposed brick foundation on the north and west faces showed open joints throughout and two sections where frost action had pushed individual bricks outward by 1/4 to 3/8 inch. The agent knew from prior transactions that foundation masonry in this condition would appear in the inspection report and potentially trigger a lender requirement for repair before closing. The sellers agreed to complete the work before listing to eliminate that contingency risk. The project needed to move within two weeks.

Our Solution

We mobilized within four days of the initial call. The exposed foundation on this 1906 Shingle Style home is a common brick construction with a shallow exposed course above grade on the north and west elevations, roughly 18 inches of visible masonry above the surrounding grade. The foundation brick is soft and porous, consistent with early twentieth century construction, and required NHL 3.5 mortar to stay within the original material strength parameters.

All open joints were raked to 3/4-inch depth by hand. On a foundation this age, power raking increases the risk of loosening adjacent brick that may be marginally bonded. The two displaced brick sections were removed, substrate mortar cleaned back, and the brick reset in full mortar beds with the faces aligned to the surrounding wall plane. Each reset brick was temporarily braced until the mortar reached initial set.

The full perimeter repointing used NHL 3.5 matched to a gray-brown sand that approximated the original foundation mortar color. Joint profile was a simple flush tool consistent with foundation construction from this period. The mortar wash at the sill plate junction on the north elevation, which had deteriorated to open gaps in several locations, was rebuilt using a stiff lime mortar formed to a positive slope away from the wood framing.

We completed the work in two days and provided the sellers with a written condition report and photographic documentation, formatted to include in the listing disclosure and the agent’s pre-inspection package.

The Result

The foundation presented as sound and recently repointed when buyers toured the property. The inspection report noted new mortar work on the foundation and flagged no active defects. The transaction closed without a masonry contingency. The agent has used us for three subsequent pre-listing referrals on comparable historic properties in the East Lake Bluff corridor since this project.

Questions About This Project

Why do real estate agents refer masonry contractors before listing historic homes?

A deteriorated brick foundation is the kind of item that stops a deal. Buyers see it, inspectors flag it, and lenders sometimes require a repair certification before issuing a mortgage on a pre-1920 home with a visible masonry foundation. An agent who can hand the seller a completed contractor report removes that obstacle before it appears in an inspection. That is worth more than the cost of the repair in most transactions.

What is a mortar wash at the sill plate junction and why does it matter?

The mortar wash is a sloped cementitious or lime application at the top of the foundation wall where the wood sill plate sits. It seals the interface between the top foundation course and the framing above it, directing water away from the sill rather than letting it pool at that junction. On a 120-year-old foundation, the original mortar wash has often deteriorated completely, leaving an open gap that admits insects and moisture directly into the floor framing.

Is NHL 3.5 mortar appropriate for a below-grade brick foundation?

For exposed above-grade foundation brick on an 1890s-1910s home, yes. NHL 3.5 has enough hydraulic strength to perform in damp conditions while remaining soft enough not to damage the original brick. For fully below-grade or chronically wet applications, a higher-strength formulation would be appropriate, but above-grade exposed foundation work on a historic home should stay within the lime-mortar system.

Project Location

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