• – Recognized industry standard for synthetic chinking
• – Superior elasticity – won’t tear, preventing weather and insect infiltration
• – Limited lifetime warranty
• – Introduced in 1985 – proven formula
• – Water-based – easy to apply and clean up
• – Freeze-thaw stable

Application

Fundamental Caulking Application Guidelines

• Proper substrate preparation and application are imperative for product longevity. Download and read the entire Information Sheet before applying any product.
• Best results are obtained when Log Jam is applied to clean, dry, stained wood. Make
  certain there is compatibility between your stain and Log Jam. Call Sashco for guidance
  if in doubt.
• Check the weather forecast. Finishing products are best applied in moderate weather
  conditions, i.e., out of direct sunlight, dry conditions and warm.
• Check the log surface temperature. The ideal application range is between 50-90°F.
• Install a bond breaker before Log Jam is applied. Backer rod, Grip Strip, and bond-breaking
  tape perform this function well. If Log Jam is applied over white styrene bead-board,
  it is best to cover the bead-board with polyester tape (to prevent adhesion to the
  beadboard). We do not recommend the use of blue or pink extruded polystyrene board.
• Gun the chinking over the backing material. Ideal sealant depth is 1/2 of the joint
  width, but no less than 1/4″, nor more than 1/2″.
• Tool Log Jam to ensure good contact with the log surfaces, especially to the upper
  log; this will greatly aid adhesion.
• All chinking products may occasionally “blister”. To avoid blistering:
  • Do not apply in direct sunlight.
  • Protect from direct sunlight for 1-2 days after application with white plastic sheeting
    tacked over the fresh chinking.
  • For detailed information, read Sashco’s Savvy Bulletin, “Preventing Blisters”.

Application Steps

Round Logs

• 
  1. Install Grip Strip into caulk well of clean, stained logs.
• 
  2. Or, install backer rod into caulk well of clean, stained logs.
• 
  3. Gun Log Jam over the backer rod.
• 
  4. Lightly mist the Log Jam as needed.
• 
  5. Tool to ensure a tight seal to the top and bottom of the chink line.

Appalachian Style Logs

• 
  1. Start with logs that are stained with a coating compatible to Log Jam and have properly installed backer material.
• 
  2. Tape the entire joint using polyester tape.
• 
  3. Gun Log Jam over the backer material.
• 
  4. Lightly mist the trowel as needed.
• 
  5. Tool to ensure a tight seal to the top and bottom of the chink line.

Corner Joints

• 
  1. Install backer rod into corners of clean, stained logs.
• 
  2. Gun Log Jam over the backer rod.
• 
  3. Lightly mist the Log Jam as needed.
• 
  4. Tool to ensure a tight seal.

* NOTE: use a bond breaker (i.e., backer rod) when significant log movement could occur. When movement is known to be minimal (as with many older homes) using backer rod is still best, but usually less critical.

Color Chart

Technical Data

• Color

  Mortar White, White, Buff, Tan, Gray, Woodtone Cedar

• Packaging

  5-gallon straight-sided white pails and 29 oz. fiber cartridges

• Water Resistance

  Log Jam forms a water-resistant skin in 1-4 hours after application. This resistance depends on bead size, humidity and temperature. If applied in cool or humid weather and rain is imminent, covering the chinking with a plastic sheet may be necessary.

• Service Range

  -30°F to 250°F

• Paintability

  Paintable with oil or latex stains after 1 week cure time. If giving chinking a facelift with Brush Over, make sure chinking is cured.

• Compatibility

  Compatible with most sealers and preservatives, including linseed oil, borates, pentachlorophenol and copper compounds. NOTE: Some coatings contain wax or other chemicals, making adhesion difficult. Call Sashco for more information.

• Shelf Life

  18 months from date of packaging.

• Passes

  ASTM C834-00 Latex Sealing Compounds, ASTM G-53 QUV
  Accelerated Weathering: 4,000 hrs
  ASTM D-638 Max 230%, Tensile Strength 36psi, after 28 days room temperature cure
  ASTM C-920 (12.5)

• VOC

  0.28 lbs/gal; 34 g/liter; less than 4% by weight

• Warning

  This product contains a chemical(s) which is reported by the State of California to cause birth defects or reproductive harm.

• Adhesion ¹ ² (180° Peel)

  Call Sashco for stain compatibility with Log Jam

• Cure-Through Time

  3 weeks (1/2″ thickness. 70°F, 50% relative humidity)

• Viscosity

  Approximately 280,000 cps at 10 rpm, spindle #14

• Freeze-Thaw

  Passes at least 5 cycles (0°F to 70°F)

• Hardness (Shore A)

  29

• Slump

  1/16″ (Max) in test joint (3-1/2″H x 3/4″D) at 70°F

• Stain

  None

• Tack-Free Time

  Less than 30 minutes (70°F, 50% relative humidity)

• Water Resistance

  No washout (4 hours; 40°F, 50% relative humidity)

• Weathering

  Washout – None
  Cracking – None
  Discoloration – Passes ASTM C834-00

• Snow

  Be cautious of areas where snow builds up around the structure and remains for extended periods of time. Snow removal is recommended for these areas to ensure the ultimate adhesion of Log Jam.

¹ Ultimate adhesive strength attained in 3-6 weeks depending on bead size, temperature and humidity.
² Dry adhesion is tested after 28 days room temperature cure. The average of several tests is reported.