May Home Maintenance Checklist: Finish Exterior Season Strong

May finishes what spring started. Across much of the country, milder weather makes this a useful month to inspect deck finishes, exterior sealant, paint, pavement, and outdoor-faucet backflow protection. An inspection does not mean every surface needs coating or every joint needs another bead. Use what you find, the installed-product instructions, and local requirements to decide the work.

If April went well, May carries roughly half its load. Our spring maintenance guide takes the wide view of the whole season; here we're only concerned with what May itself demands.

Inspect the deck before choosing a finish

Start with structure. From a stable walking surface, look for movement at guards, stairs, posts, or connections; loose or damaged boards; corrosion; decay; and water that cannot drain. Stop using an unstable area and arrange a qualified deck inspection.

On a sound wood deck, water that stops beading can indicate that a finish review is due. It does not identify the right cleaner, preparation, coating, or recoat date. Follow the wood-treatment and finish manufacturers' instructions for weather, drying, application, and compatibility. Do not pressure wash or sand painted pre-1978 components without EPA lead-safe controls.

SeasonKeep uses two years as the baseline review point and one year in several high-exposure climate zones. Treat those dates as prompts to assess condition. USDA wood-finish guidance explains why exposure, species, treatment, and finish matter. Our deck, siding, and exterior guide covers the full decision.

Check sealant, paint, and pavement

These checks share one rule: identify the material and cause before choosing a repair.

• Inspect exterior sealant. Look for gaps, cracking, loss of adhesion, and nearby staining. Identify the joint, materials, and drainage path before removing anything. Do not cover weep openings or failed flashing, and use the component and sealant instructions together.
• Inspect paint without disturbing it. Look from the ground for peeling, blistering, chalking, staining, and exposed substrate. Correct the moisture source before repainting. If the home was built before 1978, EPA recommends a Lead-Safe Certified contractor; DIY work needs EPA containment, dust-control, cleanup, and waste practices.
• Inspect driveway cracks and drainage. Note new cracks, widening, settlement, heaving, loose material, and ponding. Use a filler or coating only when its instructions match the pavement and condition. Movement and recurring water need diagnosis before a surface treatment.

Get the irrigation system tested and legal

If you have an in-ground sprinkler system or threaded outdoor faucets, identify the installed backflow protection and check the local water authority's requirements. EPA explains that cross-connections can allow non-potable water into the drinking-water system. Device types do not share one homeowner test. Use a qualified plumber or certified tester when the local rule or device instructions require one.

In freeze climates, coordinate any required test with the system's approved spring-startup procedure. Keep the report when the water authority requires documentation.

No irrigation system? Threaded outdoor faucets may still have backflow or backsiphonage protection. Look for missing, damaged, leaking, or altered components without disassembling the device. Use the local water authority or a qualified plumber when the device type, required test, or repair is uncertain.

Review pest conditions before summer

Use May to review or continue the outdoor checks that follow the local mosquito, tick, and flea season:

1. Remove accessible standing water. Walk the yard and empty plant saucers, toys, buckets, tarps, and similar containers. EPA recommends changing water in bird baths, fountains, wading pools, rain barrels, and plant trays at least weekly. Use local mosquito-control guidance for water that cannot be emptied.
2. Review tick and flea habitat. Check the areas people and pets use for tall grass, leaf litter, brushy borders, shade, overwatering, and wildlife food. CDC recommends reducing tick habitat around frequently used yard areas and coordinating flea prevention with a veterinarian. Apply a yard pesticide only to an identified, relevant habitat and exactly as its label directs.
3. Cut shrubs back from the house and outdoor equipment. Keep plants from touching siding, hiding the foundation, or blocking HVAC airflow. Use the equipment manual for required clearances and keep safe service access. Hire pruning near utilities, roofs, or other hazards.

Last call on cooling prep

If the home has central AC or a heat pump and pre-season service did not happen in April, arrange qualified service before regular summer use. The installed model defines the work, and a local contractor defines the scope and price. Two owner checks still help:

• Inspect condensate drainage. Look for standing water, leaks, overflow, or blockage at accessible drains and pans. Use only the owner procedure in the installed equipment manual; do not assume vinegar, bleach, or another cleaner is approved for every drain, pump, pan, or coil. Ask a qualified technician to handle inaccessible or recurring blockage.
• Clear loose debris from the outdoor unit if you have one. Keep plants from blocking airflow, but do not open panels, bend fins, or spray electrical components. Rinse only when the installed model's owner instructions permit it.

For the month-by-month picture of heating and cooling care, see our HVAC maintenance schedule.

If your home has the extras

One line each for the specialty systems. If a pool was seasonally winterized, use the exact cover, pump, filter, heater, and sanitizer instructions or hire a qualified pool professional to reopen it. Keep the pool closed until the barriers, drain covers, equipment, and water are ready for use. Generator owners should compare run hours and maintenance alerts with the exact model manual; oil, filter, air-cleaner, and break-in intervals are not universal. EPA recommends professional septic inspection at least every three years for a typical household system. Pumping depends on measured tank condition, system design, household use, and local requirements; systems with mechanical parts need more frequent service.

Common questions

Is May a good time to review a deck finish?

Often, but the product label and weather forecast control application. Inspect the structure first. If the wood is sound and the finish needs renewal, follow the cleaner, preparation, moisture, temperature, dry-time, and recoat instructions for that exact system.

Do I really need a certified backflow test, or can I check it myself?

If your water authority requires a certified test, a visual homeowner check does not replace it. Requirements and accepted tester credentials vary, so use the authority's current cross-connection program and the installed device instructions.

When does mosquito control actually need to start?

It depends on local mosquito activity and weather rather than an IECC zone alone. Start weekly container and drainage checks when mosquitoes are active locally, and continue as long as water can collect. Follow the local health or mosquito-control program when the season or an unemptyable water source is uncertain.

What if I never finished April's list?

Do April's water-management tasks first, especially visible drainage problems. Then inspect the deck and exterior joints while the weather makes them easy to see and document.

May's task list looks different in Duluth than it does in Dallas, and a home with a pool, a well, and a cedar deck has a different month than a condo. SeasonKeep filters 227 rules using your ZIP code, build year, systems, and features. Next up: the June checklist, where the focus shifts from finishing projects to monitoring heat-related systems.