Shop Vents & Blocks

Protect attic health on every build with top-quality vents and blocks for your home weatherization projects at Arlington Coal and Lumber Company. Understanding vents and blocks is critical; professional-grade ventilation control is vital for preventing ice dams and condensation build-up in roof assemblies, making these items a necessary sub-category under home weatherization. Contractors executing ventilation layouts begin by mounting Cor-A-Vent V600E enhanced ridge vents (4-ft length, 12 pieces per carton), GAF Cobra gunnable ridge vents (10.5-in x 20-ft), Cor-A-Vent S-400 white soffit vent strips (1-in x 3/4-in x 48-in), Cor-A-Vent S-400 white soffit vent strips (1-in x 1-1/2-in x 48-in), Cor-A-Vent S-400 black soffit vent strips (4-ft), and Accuvent plastic attic rafter vents - engineered to maintain clear intake and exhaust pathways along rooflines and overhangs, plus many more.

 

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Let's understand vents and blocks for home weatherization. Vents and blocks form an integrated system designed to regulate the temperature and moisture levels inside an attic space. Proper roof ventilation requires a balanced flow: cool, fresh air enters through the intake vents located in the soffits or eaves, while hot, humid air escapes through exhaust vents placed at the roof ridge. Baffles, or ventilation blocks, play the crucial supporting role of keeping the airflow channels open. When loose-fill or batt insulation is installed, it can easily spill over the exterior wall top plates, clogging the soffit intakes. Installing a rigid baffle creates a physical barrier that holds the insulation back, preventing wind-washing and ensuring a continuous, unrestricted path for air to move from the eaves to the ridge. This continuous air exchange extends the life of your roof shingles, lowers cooling costs in the summer, and prevents destructive ice dams from forming in the winter.

 

Buyers Guide: To help you establish a perfectly balanced ventilation system, review these frequently asked questions regarding roof vents and baffles.

 

• Does the V600E provide enough Net Free Vent Area (NFVA) for steep roof pitches? Yes, it offers an exceptional 20 square inches of NFVA per linear foot, providing ample exhaust capacity that performs flawlessly even on steep-sloped roofs.
  
  
• How do the 4-ft rigid sections hold up against high wind-driven rain compared to rolls? Rigid ridge vents are highly structural and resist compression, featuring internal weather filters and baffles that deflect wind-driven rain and snow far better than softer roll materials.
  
  
• How many cartons do I need to cover a standard 40-ft roof ridge line? Each carton of Cor-A-Vent contains 12 pieces measuring 4-ft each, totaling 48 linear feet. One carton will easily cover a 40-ft ridge with enough left over for trimming.
  
  
• Can I use a standard roofing coil nail gun without crushing the mesh fabric? Yes, you can use a pneumatic nail gun, provided you properly calibrate the depth gauge so the nail head rests flush with the surface without crushing the vent matrix.
  
  
• Does the 20-ft roll style require an external baffle to stop blowing snow? High-quality roll vents like the GAF Cobra feature a dense internal weather-resistant filter that stops blowing snow and rain, usually eliminating the need for an external baffle.
  
  
• Is it compatible with hand-nailing if I do not own a pneumatic nailer? Absolutely. Most ridge and soffit vents can easily be hand-nailed using standard roofing nails, making them accessible for DIY installations.
  
  
• When do I choose the 3/4-in depth of the PS-400 over the deeper S-400 model? The 3/4-in depth is ideal for retrofits and remodeling where existing narrow soffit channels or tight clearances restrict the use of thicker materials.
  
  
• Can this white strip be painted to match a custom off-white trim color? Yes, the plastic construction can be painted. It is recommended to use a high-quality exterior-grade acrylic latex paint for proper adhesion.
  
  
• Does it provide enough airflow to match high-capacity ridge vents? Soffit vent strips provide excellent continuous intake. You simply need to install enough linear footage to match or slightly exceed the NFVA of your exhaust vents.
  
  
• Is there any structural or airflow difference between the White and Black versions? No, the structural integrity and Net Free Vent Area are exactly the same. The choice is purely aesthetic to match your exterior trim.
  
  
• Does the 1-1/2-in depth fit into standard aluminum or vinyl soffit channels? Yes, the 1-1/2-in profile is a standard depth that slots cleanly into typical J-channels used for vinyl and aluminum soffit systems.
  
  
• How do I cut these 4-ft strips without cracking or fraying the plastic layers? They can be easily cut to length using a sharp utility knife, standard aviation snips, or a circular saw with a fine-tooth blade.
  
  
• Will heavy blown-in cellulose insulation crush or collapse this plastic baffle? No, rigid plastic baffles like Accuvent are engineered to withstand the weight and pressure of deep blown-in insulation without collapsing the air channel.
  
  
• Does it completely seal off the soffit opening to prevent wind washing of insulation? Yes, when properly stapled to the top plate and rafters, the block acts as a barrier that prevents cold wind from pushing into the insulation layer, preserving its thermal performance.
  
  
• Do I need staples or specialized fasteners to attach it to the roof rafters? Standard heavy-duty staples (typically 3/8-in or 1/2-in) fired from a hammer tacker or staple gun are all you need for a secure installation.
  
  
• How many feet of S-400 intake vent do I need to balance one foot of V600E exhaust vent? You must match the NFVA. If the ridge exhaust is 20 sq in per foot, and the soffit provides 10 sq in per foot, you need two linear feet of soffit intake for every one foot of ridge exhaust.
  
  
• Will mixing GAF Cobra ridge vents with Cor-A-Vent soffit strips void any warranties? Generally, no. Mixing intake and exhaust brands does not void the warranty of the vents themselves, though you should always verify the specific warranty requirements of your roofing shingle manufacturer.
  
  
• How do I calculate total ventilation needed? The standard building code rule is the 1/300 rule: you need 1 square foot of ventilation for every 300 square feet of attic floor space, split evenly between intake and exhaust.
  
  

Popular Ideas and Applications for Vents and Blocks:

 

• Cathedral Ceiling Airflow: When building cathedral or vaulted ceilings, utilizing rigid plastic baffles between every single rafter ensures uninterrupted airflow from the eaves to the peak, preventing the roof deck from sweating and rotting.
  
  
• Ice Dam Prevention in New England: By pairing high-capacity continuous soffit vents with deep attic baffles, homeowners create a cold roof system that stops snow from melting and refreezing at the eaves, effectively eliminating destructive ice dams.
  
  
• Deep Energy Retrofits: When upgrading a home to meet modern energy standards, installing continuous ventilation blocks allows crews to pack the attic with R-60 insulation right to the wall edges without suffocating the roof's fresh air supply.
  
  
• High-Humidity Exhaust Management: Proper roof ventilation ensures that any ambient moisture from bathroom exhaust fans that inadvertently leaks into the attic is rapidly carried away, preventing mold growth on the roof trusses.
  
  
• Hidden Architectural Intake: Using narrow continuous strip vents painted to match custom wood soffits provides maximum air intake while remaining virtually invisible from the ground, preserving the historical or architectural aesthetic of the home.
  
  

We also offer a wide selection of quality home weatherization products to complete your build. Fortify your building envelope with reliable flashing, shield your surfaces with heavy-duty floor protection, seal your exterior walls using breathable house wrap, and ensure your roof breathes properly with our vents and blocks, plus many more.

 

You can also shop for all product categories with our complete building products in-stock, ranging from structural building materials and reliable fasteners, to essential hardware. We are a premier local lumberyard offering top-grade lumber, composites, and plywood, as well as beautiful moulding and millwork, and so much more.