Solar panels and roof replacement are two major home investments that Minnesota homeowners increasingly need to coordinate. Whether you''re considering adding solar to your existing roof, need to replace a roof that already has panels, or want to plan both projects together, understanding the relationship between your roofing system and solar installation is essential. At Weatherguard Construction, we''ve worked with homeowners and solar installers across Stillwater, Woodbury, Minneapolis, and the Twin Cities metro to ensure both systems work together properly.
Should You Replace Your Roof Before Installing Solar Panels?
This is the most common question we hear, and the answer is almost always yes — if your roof is more than 10–15 years old, you should replace it before installing solar panels. Here''s why:
Solar panels last 25–30 years. If your roof only has 10 years of life remaining when solar panels are installed, you''ll face the expensive process of removing the panels, replacing the roof, and reinstalling the panels mid-way through the solar system''s lifespan.
Removal and reinstallation costs are significant. Having a solar installer remove and reinstall panels for a roof replacement typically costs $3,000–$7,000 or more, depending on system size and complexity. This cost is entirely avoidable by replacing the roof first.
Roof warranties can be affected. Solar panel mounting systems penetrate the roof surface with lag bolts into the rafters. If these penetrations aren''t properly sealed, or if the roof fails around the mounting points, warranty coverage becomes complicated.
New roofing maximizes solar investment. Starting with a brand-new roofing system underneath your solar panels means both systems are on the same lifecycle, and your roof will be in peak condition to support the panels for their entire productive life.
What If You Already Have Solar Panels and Need a New Roof?
If your roof is failing and you already have solar panels installed, here''s the process:
Step 1: Coordinate with Your Solar Installer
Contact your solar provider first to arrange panel removal. You''ll need to know:
- The cost of removal and reinstallation
- Whether removal will void any solar equipment warranties
- Timeline for removal and how long panels will be stored
- Whether your solar system''s monitoring and connection will be interrupted
Step 2: Schedule Your Roof Replacement
Once panels are removed, your roofing contractor can perform a thorough inspection and complete replacement without obstructions. This is the ideal time to upgrade your roofing system with premium components.
At Weatherguard Construction, we coordinate timing with your solar installer to minimize the gap between panel removal and roof completion, reducing the time your home is without solar production.
Step 3: Reinstall Solar Panels on the New Roof
After roof replacement, your solar installer remounts the panels on the fresh roof surface. New flashing boots and sealant ensure weathertight penetrations, and your solar system picks up where it left off.
Choosing the Right Roofing System Under Solar Panels
When replacing a roof that will support solar panels, material selection matters:
Asphalt shingles remain the most common and compatible roofing material for residential solar installations. Standing seam metal mounting brackets attach to the shingle surface and penetrate into the rafters below. Quality architectural shingles from Owens Corning provide an excellent foundation.
Metal roofing offers a unique advantage for solar: standing seam metal roofs allow clamp-on solar mounting systems that require no roof penetrations at all. This eliminates potential leak points and simplifies future panel removal if needed.
Tile and slate can support solar panels but require specialized mounting systems and experienced installation. The fragility of these materials demands careful handling.
Regardless of roofing material, we always install ice and water shield membrane around every solar panel mounting penetration for additional water protection — critical in Minnesota''s storm-prone climate.
Planning Both Projects Together: The Ideal Approach
If you''re in the fortunate position of planning both a roof replacement and solar installation together, here''s our recommended approach:
- Start with a roof inspection: Contact Weatherguard Construction for a free assessment of your current roof condition
- Consult with a solar installer: Get a solar proposal that includes system size, panel layout, and mounting specifications
- Share plans between contractors: Your roofing contractor should know where panels will be mounted, and your solar installer should know what roofing material will be used
- Replace the roof first: Complete the full roof replacement with proper underlayment, flashing, and ventilation
- Install solar within 2–4 weeks: Once the roof is complete and inspected, the solar installation can proceed on a pristine surface
This coordinated approach is most common among homeowners in Eden Prairie, St. Paul, and other Twin Cities communities where solar adoption is growing rapidly.
Solar Panel Considerations for Minnesota''s Climate
Minnesota''s climate creates specific considerations for roofs supporting solar panels:
Snow shedding: Solar panels can impede natural snow shedding from your roof, causing snow accumulation above the panel array. This increased snow load must be considered in the roof''s structural capacity.
Ice dam interaction: Panels change the thermal dynamics of your roof surface, potentially affecting ice dam formation patterns. Proper attic insulation and ventilation are even more important on solar-equipped roofs.
Wind exposure: Solar panel arrays create additional wind uplift forces on your roof. The roofing system underneath must be rated for these additional loads — another reason to use quality materials and professional installation.
Work with an Experienced Roofing Contractor
When solar panels are involved, your roof replacement requires a contractor who understands the interaction between roofing systems and solar installations. Weatherguard Construction brings 25+ years of experience as an Owens Corning Platinum Preferred Contractor, ensuring your new roof provides the ideal foundation for your solar investment.
We serve homeowners across Minnesota from our Stillwater headquarters, plus communities in Denver, Centennial, and Schaumburg.
Call (651) 439-4320 or book your free roof inspection. MN LIC #BC282484.
Frequently Asked Questions
How old should my roof be before I consider replacing it before solar?
If your roof is more than 10 years old when you''re planning solar installation, we recommend replacing it first. Since solar panels last 25–30 years, you want a roof that can match that timeline without requiring mid-life replacement.
Will solar panel mounting damage my new roof?
When properly installed by qualified professionals, solar panel mounting systems do not damage your roof. Lag bolts are drilled into rafters (not just sheathing) and sealed with specialized flashing. The key is using experienced installers who follow manufacturer guidelines.
Can Weatherguard Construction install solar panels too?
We focus exclusively on roofing, siding, windows, gutters, and decking — the exterior systems we''ve mastered over 25+ years. However, we regularly coordinate with reputable solar installers and can recommend trusted partners in the Twin Cities area.
Does solar panel removal and reinstallation affect my solar warranty?
This depends on your solar provider and warranty terms. Most solar manufacturers allow professional removal and reinstallation without voiding equipment warranties, but labor warranties from the installer may be affected. Always check with your solar provider before scheduling roof work.
