Painting-with-Linseed-Oil-Specification.doc

TECHNICAL SPECIFICATION

PAINTING

PART 1 - GENERAL

1.1 PROJECT CONDITIONS

A. Examine the condition of substrates on which paint or coatings will be applied. Contractor shall notify the Contracting Officer if substrate conditions would compromise the application of surface coatings. NPS staff should report or mitigate conditions in similar situation. Conditions may include, but are not limited to:

1. Moisture content of the substrates to be painted exceeds 12%.

2. Substrate must be durable and not compromised due to deterioration, insect infestation, or material flaw.

B. All surfaces previously painted are to be repainted, including wall, trim and railings. All should be painted to match existing color, as approved by cultural resource specialists or the Contracting Office. Exterior siding and eaves shall be painted [INSERT COLOR] to match existing. Window sash, doors, and trim shall be painted [INSERT COLOR] to match existing.

C. Proceed with painting only after satisfactory conditions are met.

PART 2 - MATERIALS

2.1 COLORS AND FINISHES

A. Finishes shall be selected for their performance, dependent on the substrate. Unless specified, products for wood substrates should be based with linseed oil or pine tar; products with comparable quality to Ottosson, Viking, and Allback may be used.

B. For colored finishes, products must match the hue, sheen, and texture of the existing materials once applied to the surface.

C. Paint, surface treatments, and finishes are to be applied following the manufacturer’s application instructions unless otherwise specified.

PART 3 - EXECUTION

3.1 PRoject conditions

A. Painting should only occur when conditions at the individual project site satisfy requirements in this section.

B. Apply finish material when temperature of surfaces to be painted and the surrounding air temperatures are between 50 and 90 degrees F, unless otherwise permitted by the paint manufacturer’s printed instructions.

C. Apply finishes only when air is free of dust that would speck the finish; windspeeds should not exceed 8mph unless otherwise approved. Project locations are subject to extreme wind conditions.

D. Do not apply exterior materials in damp, rainy weather, or when the relative humidity exceeds 85 percent. Painting may be continued during inclement weather only if the areas and surfaces to be painted are enclosed and heated within temperatures limits specified by the paint manufacturer during application and drying periods.

3.2 Surface preparation

A. Sandblasting is prohibited for preparing surfaces of all materials. Power-washing of wood materials is prohibited, but this method may be used on concrete with prior testing and approval. Washing with detergent similar to D2 Biological Solutions and scrub brushes in combination with scraping is acceptable.

B. Surface Preparation (General): Perform preparation and cleaning procedures in strict accordance with the paint manufacturer’s application instructions and as herein specified for each particular substrate condition.

1. Protect all hardware, hardware accessories, machined surfaces, plates lighting fixtures, and similar items in place and not to be finish-painted prior to surface preparation and painting operations. Remove, if necessary, for the complete painting of the items and adjacent surfaces. Following completion of painting of each space or area, reinstall the removed items by workpeople skilled in the trades involved.

2. All surfaces to be painted shall be thoroughly cleaned to remove any loose material down to finished wood or tight painted surface. Program the cleaning and painting so that contaminants from the cleaning process will not fall onto wet, newly painted surfaces.

3. Prepare existing surfaces to remove loose or scaling material. Scrape surfaces by hand using a hand scraper attached to a shop vacuum, or equivalent system. If lead containing paints are present, consider utilizing a hand scraper attached to a HEPA vacuum. Refrain from using paint removal systems (physical or chemical) which will damage the substrate. Feather edges to provide for smooth finish with an orbital sander. Patch existing surfaces as required to provide smooth, even surface ready to receive new finish.

4. Remove dirt, loose mortar, scale, powder, mildew/biological growth, and other foreign matter from surfaces which are to be painted with linseed oil soap.

3.3 MATERIALS PREPARATION

A. Mix and prepare painting materials in accordance with manufacturer’s directions.

B. Store materials not actively in use in tightly covered containers. Maintain containers used in storage, mixing, and application of paint in a clean condition, free of foreign materials and residue.

C. Stir materials before application to produce a mixture of uniform density and stir as required during the application of the materials. Do not stir surface film into the material. Remove the film and, if necessary, strain the material before using.

3.4 APPLICATION

A. Apply paint in accordance with the manufacturer’s directions. Use applicators and techniques best suited for the type of material being applied. Materials shall not unduly thinned.

1. Prime all bare existing wood with one coat of with Purified Linseed Oil. Prime new wood with a mixture of Purified Linseed Oil (70%) to linseed oil paint (30%).

2. Apply a minimum of a two coats of specified linseed oil paint. Apply additional coats as needed to provide uniform color appearance and coverage.

3. Pigmented (Opaque) Finishes: Completely cover to provide an opaque, smooth surface of uniform finish, color, appearance, and coverage. Cloudiness, spotting, holidays, laps, brush marks, runs, sags, ropiness, or other surface imperfections will not be acceptable.

4. Touch-up Paint: The Contractor shall provide one gallon of touchup paint for each different color and type of paint utilized for each structure painted. The paint will be provided in clean, unopened containers with a label describing the following information: manufacturer’s name, color/type of paint and building number where it was applied.