Direct replacement thermoformed polycarbonate square flat-top pyramid skylight for 18"×18" roof openings. White. 21-1/2"×21-1/2" outer flange. Flat-top pyramid dome profile. No metal flanges. Approved elastomeric sealant included. Made in the USA.
A flat-top pyramid dome has straight angled sides that rise from the flange to a flat top panel — unlike a bubble dome which has a single rounded curve. The result is a more angular, architectural profile that sits differently on the roof than a standard bubble skylight. This is a specific dome style used on certain RV models. If your existing skylight has a flat-top pyramid profile, replacing it with a standard bubble dome will look different. Verify your existing dome profile before ordering.
The Specialty Recreation SL1818W is a direct replacement flat-top pyramid square skylight for RVs with 18"×18" roof openings. The flat-top pyramid profile matches the style of original equipment skylights found on certain Class A, B, and C motorhomes and travel trailers — providing a like-for-like replacement that maintains the original roof appearance rather than substituting a bubble dome.
White tint passes maximum natural daylight. Same proven Specialty Recreation thermoformed polycarbonate construction: approved elastomeric sealant included, no metal flanges, smooth glossed surface for easy cleaning.
Angular flat-top dome matches original equipment on certain RV models — maintains the original roof appearance unlike a bubble dome
White tint maximizes natural light transmission — bright, open interior feel
UV-resistant, impact-resistant construction — durable replacement for aged or cracked original skylights
Specialty Recreation manufactures their skylights domestically — sealant included, 1-year warranty
The approved elastomeric sealant included with this skylight is specifically compatible with polycarbonate. Do not substitute self-leveling lap sealants (such as Dicor or similar) — these contain chemicals that react with polycarbonate and can cause cracking and failure of the dome.
The Specialty Recreation Inc. product warranty covers defects in workmanship and materials for 1 year from the date of purchase. Warranty does not apply to damage caused by improper installation. Note: Some product listings reference a 90-day warranty term; Specialty Recreation's published warranty policy is 1 year.
• (1) SL1818W White Flat-Top Pyramid Square Skylight • (1) 10 oz tube of approved elastomeric sealant • Care instructions • Installation instructions NOT Included: • Interior garnish/trim ring (sold separately) • Mounting screws/hardware
Verify both measurements and the dome profile before ordering: Rough Opening: 18" L × 18" W Outer Flange: 21-1/2" L × 21-1/2" W Also confirm your existing skylight has a flat-top pyramid profile. If it has a curved bubble profile, this skylight will look different — see the N1818 inner garnish family for 18"×18" bubble-style options.
N1818 — White inner garnish for 18"×18" openings (bubble dome, 3.5" height) Need a bubble dome instead of flat-top pyramid? Specialty Recreation also offers bubble-style skylights for 18"×18" openings — verify your existing dome profile before ordering.