Resources

Project references, technical documentation, and answers to the questions we hear most often from architects, contractors, and project managers.

Products Trusted By

Project Case Studies

University of Oregon — Straub Hall

Secondary window glazing project involving the evaluation of multiple insulating upgrade options. Independent energy testing confirmed slim line insulating pane attachments provided near-identical performance to full IGU conversions at lower cost and with full preservation compliance. Hundreds of historic windows preserved.

Redmond City Hall

Historic restoration project recognized with the Restore Oregon DeMuro Award for Excellence in Preservation. Chosen Wood Windows served as the window restoration contractor

Grant High School Modernization (1923) — Portland, Oregon

Extensive historic restoration project, also recognized with a DeMuro Award for Excellence in Preservation, Adaptive Reuse and Community Revitalisation.

Woodlark Hotel — Portland, Oregon

Union of two National Register of Historic Places buildings — the Woodlark Building and the Cornelius Hotel, each more than 100 years old. Chosen served as the window restoration contractor preserving the original architectural character of both structures.

Frequently Asked Questions

Do your products comply with the Secretary of the Interior's Standards for Rehabilitation?

Yes. All three products — storm windows, Window SLIP™, and replacement sash — are designed to comply with the Secretary of the Interior’s Standards. No permanent alterations to historic fabric are required for any of our products.

Do you offer installation?

We supply all three products directly. Installation by our team is available for select commercial projects in the Pacific Northwest. All products are designed for installation by qualified contractors and carpenters outside our region.

What is the lead time on custom orders?

Lead times vary depending on product type, configuration, and order volume. Contact us with your project details for a current timeline.

Can your products be used on landmark or listed buildings?

Yes. All of our products have been specified and installed on National Historic Landmarks, National Register of Historic Places buildings, and projects subject to preservation board oversight.

What is the difference between Window SLIP™ and a storm window?

Exterior storm windows are a separate unit installed over the existing window — typically as a secondary frame. The slim line insulating pane is a low-profile pane mounted directly to the existing sash, making the original window itself simulate a double-pane unit. Insulating panes are virtually invisible, do not alter window operability, and require no seasonal removal.

Can replacement sash be made to match our existing muntin pattern?

Yes. We reproduce virtually any glass pattern and sash configuration, including both true divided lites and simulated divided lites. We can match existing muntin profiles, spacing, and grid configurations.

What glass options are available for replacement sash?

Options include annealed, tempered, and laminated single-pane glass, as well as insulating glass units (IGUs) with air or argon gas fill and low-E coatings. Our default IGU glass is Solarban 60, which accurately replicates the appearance of original single-pane clear glass while delivering significantly improved thermal performance.

Are technical drawings or spec sheets available?

Yes. Product specifications, detail drawings, U-value data, and guide specifications are available in the Technical Documentation section below.

Product Downloads

Window SLIP

Window SLIP Product Brochure

Overview of the Window SLIP system, features, benefits, and applications.

SLIP Detail Drawings

Technical drawings and installation details for the Window SLIP system.

SLIP Measurement Sheet

Measurement worksheet for planning and ordering Window SLIP units.

Guide Specification, Section 08 80 10

Architectural guide specification for specifying Window SLIP systems.

University of Oregon Energy Report

Energy performance analysis of the Window SLIP system conducted at the University of Oregon.

Case Study

University of Oregon case study on SLIP window attachments for historic window preservation.

Storm Windows

Storm Window Details

Technical drawings and installation details for Historic Window Products storm window systems.

Storm Window Quote Sheet

Quote sheet for storm window measurements, specifications, and project details for pricing.

Replacement Sash

Replacement Sash Catalog

Overview of custom wood sash replacement options, features, finishes, and energy-efficient glass.

Replacement Sash Measurement Sheet

Quote sheet for replacement sash measurements and project details for pricing.

Wood Window Restoration

Guide Specification, Section 08 80 10

Architectural guide specification for specifying Window SLIP systems.

Restoration Brochure

University of Oregon case study on SLIP window attachments for historic window preservation.

Window Restoration Products

Resources

Products Trusted By

Project Case Studies

University of Oregon — Straub Hall

Redmond City Hall

Grant High School Modernization (1923) — Portland, Oregon

Woodlark Hotel — Portland, Oregon

Frequently Asked Questions

Product Downloads

Window SLIP

Window SLIP Product Brochure

SLIP Detail Drawings

SLIP Measurement Sheet

Guide Specification, Section 08 80 10

University of Oregon Energy Report

Case Study

Storm Windows

Storm Window Details

Storm Window Quote Sheet

Replacement Sash

Replacement Sash Catalog

Replacement Sash Measurement Sheet

Wood Window Restoration

Guide Specification, Section 08 80 10

Restoration Brochure

Need Specs for a Project File?

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