RV Slide Topper Sagging or Holding Water
Quick answer
Water sitting on an extended slide topper is something the makers expect, not a fault. Carefree's manuals call it pooling and say to retract the room in steps of 8 to 12 inches to dump the water, and to close the room in steps of about 6 to 8 inches if you must close it in rain. A topper that hangs loose and will not roll up tight when the room closes is a different problem: the roller spring has lost tension. Carefree and Lippert both warn that fitting new fabric without rolling up the slack first causes exactly this. The fix is to reset the spring to the maker's wind count, a job with a spring that can spin the tube out of control.
Water sitting on an RV slide topper is normal, and the fix is in how you close the room. Carefree's manuals call it pooling. They say to bring the room in 8 to 12 inches at a time so the water tips off the edge. If you have to close the room while it is raining, Carefree's current Alpine manual says to do it in steps of about 6 to 8 inches. A topper that sags and will not roll up tight when the room closes is a different fault. Its roller spring has lost tension. Carefree and Lippert both warn that fitting new fabric without rolling up the slack causes exactly this. More pulling on the fabric will not fix that. The spring has to be reset to the maker's wind count.
Below is how to tell the two apart, the dumping steps from the manuals, and what Carefree and Lippert say about lost spring tension. If your topper is part of a wider awning question, RV awnings explains how all the parts fit together.
What a slide topper is, and the words that matter here
Slide topper. This is a fabric cover over the roof of a slide-out room. Carefree calls it a slideout cover, and Lippert sells it as the Solera Slider. One edge of the fabric slides into a rail on the RV wall above the room. The other edge wraps around a roller tube that rides on the outer top edge of the room. When the room goes out, fabric unrolls. When it comes in, a spring in the tube rolls the fabric back up. Lippert says its toppers help keep slide-outs "free of dirt, leaves and debris." Carefree says the canopy "helps protects the room from water, dirt and debris when the room is extended." Neither maker calls it a roof that sheds water.
Pooling. Carefree's word for "when water collects on the top of the fabric." It says this "can occur during inclement weather or if a running air conditioner discharges over the awning."
Spring tension (winds). The spring inside the roller tube is wound up before the topper goes on. One full turn of the spring end is one wind. That stored wind is what pulls the fabric tight and rolls it back up. Carefree's Alpine uses one spring at the right-hand end, or two springs with one at each end.
Box length. The width of the slide room box, measured across the front. Carefree sizes its toppers and its spring winds by this number.
Two problems that look alike
Owners often describe both faults as "sagging." They have different causes and different fixes, so start by sorting out which one you have.
| What you see | What it is | What to do |
|---|---|---|
| Room out, water sitting in a dip on the fabric after rain or under an AC drip | Pooling, which Carefree expects | Bring the room in 8 to 12 in at a time to dump it (Carefree) |
| Room closing in rain | Fabric can pool suddenly as it moves | Close in steps of about 6 to 8 in (Carefree Alpine, 2026) or 8 to 12 in (Carefree SOK III, 2018) |
| Fabric loose and hangs in a loop, will not roll up tight as the room closes | Low spring tension | Reset winds to the maker's chart (Carefree, Lippert) |
| Loose fabric soon after new fabric was fitted | Slack was not rolled up before the tube went back in | Same spring fix; the fabric is not at fault (Carefree, Lippert) |
| Fabric billows in travel | Anti-billow lock not working, often arms not fully seated in brackets | Check bracket position (Carefree Alpine) |
| Rub marks on the fabric | Debris in the track where the fabric enters the case | Clear the track (Lippert) |
Water on the topper: dump it in steps
Carefree does not treat pooling as a defect. Its manuals for the Alpine and the SlideOut Kover III say the same thing: "The water is dumped when the awning is retracted." The aim is to dump it a little at a time. Carefree says to "retract the room in steps (8"-12") to dump the water. This will help prevent the fabric from stretching or distorting."
Here is how that works in practice.
- Look before you move the room. Note where the water sits. Make sure nobody is standing under the edge where it will fall.
- Bring the room in 8 to 12 inches. As the room moves in, the roller winds up fabric. The dip gets shallower and the water spills over the side.
- Stop and let it drain. Wait for the run-off to finish before the next step.
- Repeat until the fabric is clear. Then put the room back out if you are staying.
- Dry before storing. Carefree says to "allow the fabric to dry thoroughly before rolling up the canopy." Lippert says that if the topper was retracted wet, extend it and let it dry "as soon as conditions allow." Carefree adds that mildew can be a problem where heat and humidity are common; see awning mold and mildew.
The step size changes when it is still raining. Carefree's July 2026 Alpine service manual says: "If the room must be closed during wet weather (rain), close the room in increments (approximately 6-8")." That lets water run off as the room closes and prevents "sudden pooling." The 2018 SlideOut Kover III sheet gives 8 to 12 inches for both jobs. The smaller step is the newer advice, and it costs only a few more stops.
Carefree names one cause owners can fix: a running air conditioner that "discharges over the awning." If a roof AC drips onto the topper, the water will keep coming back however often you dump it. Find where the drain runs and move it.
What about center supports and foam blocks?
Forum threads often suggest a center bracket, a foam block or a pool noodle under the fabric to stop the dip. None of the maker documents read for this page mentions any of these. Carefree's long XL toppers do have center cradles, but those hold up the roller tube, not the fabric. Carefree's fix for water on the fabric is the stepped retraction above. Anything else is outside the maker's instructions. If your topper is under warranty, ask the dealer before fitting one.
A sag that will not roll up tight: lost spring tension
Normal pooling goes away as the room comes in, because the spring winds the fabric tight. If the fabric still hangs loose as the room closes, the spring is not pulling hard enough. Lippert's troubleshooting chart lists "Fabric sags or is loose" and gives two checks: "Check tension on springs" and "Make sure the end caps are properly secured." For fabric that "will not roll up," it says to check spring tension and look for debris in the fabric opening or case.
Both makers name the same way tension gets lost: fitting fabric with the slack not rolled up. Carefree's Alpine manual puts it in a NOTICE in the canopy replacement steps:
Watch out when fitting new fabric: Carefree warns that "Failure to roll up the slack before installing the roller tube will reduce the spring tension. Reduced spring tension can cause the fabric to sag and not roll up correctly when closing the room." Lippert's Solera Slider manual says unrolling the fabric "more than one turn will cause the slide topper to lose tension and create slack when closing the slide room." Lippert also says to leave the room closed, or out no more than 6 inches, while you fit it.
The spring is wound to suit the box length with the room closed. Carefree's notice gives the result in plain words: the slack "will reduce the spring tension." So a topper that sagged from the day new fabric went on points to the winds, not to the new fabric. The patio awning version of this job is in RV awning fabric replacement which covers counting spring turns.
The manuals read for this page give no service life for slide topper springs. Carefree does list the springs as separate parts, and its manual has a full spring replacement procedure.
If it billows on the road instead
Fabric that flaps open while you drive is a separate fault. Carefree's toppers have an anti-billow lock that sets itself when the room closes. The Alpine manual warns that if the arms are not fully seated in their mounting brackets, the lock may not work, "allowing the awning to billow." So check the brackets first. For patio awnings that open in transit, see RV awning opened while driving.
Spring safety: read this before you touch the end caps
Safety warning: Carefree's procedures "deal directly with the pre-wound spring tension in the roller tube." If the spring is released too early, "the roller tube can spin out of control," which can cause injury. When a locking pin is pulled, "the spindle will turn rapidly." Carefree says a second person "is required to hold the roller tube." Lippert warns that "improperly secured roll tube springs can cause personal injury." Carefree recommends that adjustments and repairs be done by trained technicians at an authorized Carefree dealer, and says work by others may void the warranty.
That warning is why this page does not walk through the job. The same hazard on patio awnings is covered in RV awning adjustment. If you do have it done, it helps to know what the technician is working from. On the Alpine, each end of the tube is locked with a 3/16 x 1 1/4 inch pin before anything comes apart. The spring end is then turned with a 7/16 inch socket, one full turn per wind. Carefree adds winds counterclockwise on a right-hand spring and clockwise on a left-hand one. The winds come from a chart keyed to box length.
| Box length | Winds | Box length | Winds |
|---|---|---|---|
| 5 to 5.5 ft | 18 | 10 to 10.5 ft | 17 |
| 6 to 6.5 ft | 19.5 | 11 to 11.5 ft | 18 |
| 7 to 7.5 ft | 21 | 12 to 12.5 ft | 19 |
| 8 to 8.5 ft | 22.5 | 13 to 13.5 ft | 20 |
| 9 to 9.5 ft | 24 | 14 to 16 ft | 21 |
The count drops at 10 ft, where the chart moves to a different spring. Part R002054-001 is for toppers 119 inches and shorter, and R002054-002 is for 120 inches and longer. The XL spring, R001859XL, takes 10 winds for boxes from 17 ft to 22 ft 11 in, and 12 winds at 23 ft and longer. These figures are for the Alpine only. Other Carefree models and other makers use their own charts.
Worked example: a 12 ft Alpine that sags after new fabric
Take a fifth wheel with a 12 ft slide room and a Carefree Alpine topper. Suppose the owner fitted new fabric last month. Since then the fabric hangs in a loose loop as the room closes, and water sits on it after every shower.
Step 1: sort the two problems. Water on the fabric with the room out is pooling, and Carefree says to dump it in 8 to 12 inch steps. The loop that stays as the room closes is not pooling. That points to the spring.
Step 2: match it to the history. The sag started with the new fabric. Carefree's NOTICE says slack left on the tube "will reduce the spring tension" and cause this exact sag. So the likely cause is fitting, not the fabric.
Step 3: find the target. A 12 ft box is 144 inches, so it uses spring R002054-002, and Carefree's chart gives 19 winds. Carefree's weight rule is 13.5 lb at 42 inches plus 1 lb for each 12 inches more. Worked through, that is 13.5 + 8.5 = about 22 lb of topper. It is light, but it is all on a wound spring.
Step 4: book it. Give the dealer the box length, the model and the history. Ask them to roll up the slack and set the winds to the chart. Do not wind extra turns in by hand to "tighten" it.
How big these toppers get
A wider topper has a wider span of fabric to dip and a longer tube to wind. These are the maker figures.
| Model | Box length | Room travel covered | Springs |
|---|---|---|---|
| Carefree Alpine (service manual, July 2026) | 42 to 336 in | Up to 42 in | One in RH end, or one each end |
| Carefree Slideout Cover (data sheet PDS0802r4, April 2026) | 42 to 202 in | 42 in | One in RH end |
| Lippert Solera Slider (CCD-0001264, 2019) | Rooms 66 to 192 in | 48 in (58 in for fabric made before August 2014) | Roll tube springs; number not stated |
Carefree's data sheet gives 13.5 lb for a 42 inch Slideout Cover, plus about 1 lb for every 12 inches more. Lippert's fabric is 6 inches shorter than the topper, measured from the center of one torsion arm to the other. The room travel matters too: a room that goes out farther than the topper covers will leave part of its roof bare. To buy or measure for a new one, see how to measure for an awning, and for the brands, Carefree RV awnings.
Habits that keep a topper from stretching
- Hose the fabric off monthly with clear water, as Carefree suggests. Use natural soap, never detergent, and water no warmer than 100F. RV awning cleaning has the full method.
- Check that the fasteners are tight from time to time, and that both end caps are secure.
- Brush off leaves and twigs before the room comes in, so nothing is rolled into the fabric. RV awning care and wind safety has the full pre-travel list.
What this answer does not cover
The figures here come from three maker documents: Carefree's Alpine service manual and Slideout Cover data sheet, and Lippert's Solera Slider manual. Dometic's SlideTopper and older Carefree models such as the SlideOut Kover II were not checked, and they may use other step sizes and spring charts. The wind table is for the Alpine and its listed spring parts only. Do not use it on another topper. This page does not cover a slide room that leaks inside, which is a seal or roof problem rather than a topper one. It also does not cover a bent roller tube or broken end caps, which need parts, not winds. Fabric that has already stretched or distorted may not roll tight even with the spring set right, and then it needs replacing. Last, spring work carries real injury risk, and Carefree says work by anyone but an authorized dealer may void its warranty. Carefree's warranty on the Slideout Cover is one year.
Key takeaways
- Water sitting on an extended slide topper is pooling, and Carefree expects it. It is not a sign the topper is broken.
- Dump it by bringing the room in 8 to 12 inches at a time. In rain, close the room in steps of about 6 to 8 inches (Carefree Alpine, July 2026).
- Fabric that stays loose and will not roll tight as the room closes means low spring tension.
- Carefree and Lippert both warn that fitting fabric without rolling up the slack reduces spring tension and causes sag.
- The fix is resetting winds to the maker's chart (19 for a 12 ft Alpine), with the tube pinned and two people. That is dealer work.
Frequently asked questions
Is it normal for a slide topper to hold water?
Yes. Carefree's manuals describe pooling as something that "can occur during inclement weather or if a running air conditioner discharges over the awning." Its fix is to retract the room in 8 to 12 inch steps to dump the water, which helps keep the fabric from stretching.
Why does my slide topper sag after I replaced the fabric?
Most likely the slack was not rolled onto the tube before it went back into the end caps. Carefree says this "will reduce the spring tension" and can make the fabric sag and not roll up. Lippert says unrolling more than one turn during fitting makes the topper lose tension. The spring needs resetting to the maker's wind count.
How many turns does a slide topper spring need?
It depends on the model and the box length. For the Carefree Alpine, the chart runs from 17 to 24 winds for boxes from 5 ft to 16 ft, with a change of spring at 120 inches. The XL spring takes 10 or 12 winds. Use the chart for your own model.
Can I just tighten the slide topper spring myself?
Carefree's procedure needs locking pins at both ends, a socket on the spring end and a second person holding the tube. Released early, the tube "can spin out of control." Carefree recommends its authorized dealers for repairs and says other work may void the warranty.
Sources and further reading
- Carefree of Colorado: Alpine Slideout Cover Service Manual, 070017-301r9 (July 2026)
- Carefree of Colorado: Slideout Cover Product Data Sheet, PDS0802r4 (April 2026)
- Carefree of Colorado: SlideOut Kover III and III XL Owner Information, 052557-201r5 (November 2018), hosted by Forest River
- Lippert: Solera Slider Installation and Owner's Manual, CCD-0001264 (Rev 05.30.19), hosted by Forest River
How we write our guides: figures are typical US ranges checked against manufacturer documentation, published standards and installer pricing. Read our editorial standards. Spotted an error or outdated detail? Request a correction.