How to measure and install a winter tarp/cover (without tearing in the wind)
1) Before buying: measuring properly avoids 80% of problems.
A winter cover needs overlap for secure attachment. Selection guides explain that, for above-ground pools, the "pool size" and the "cover size" are different (e.g., a 12' pool can use a 16' cover).
How to measure (simple way)
-
Round: measures the diameter from side to side (internal/actual point of the pool).
-
Oval/rectangular: measures maximum length x width .
If you are unsure about the shape/measurement, measurement guides for above-ground pools can help identify the essential geometry and dimensions.
Practical rule of thumb for buying (buyer intent)
-
For a winter tarp, choose a size larger to ensure extra fastening space (the overlap is what keeps it in place).
2) Preparation: what to do before applying the topping
A good installation starts days before:
-
Clean debris (net + suction)
-
brush walls/waterline
-
Balance the water according to your method (to avoid "chaotic" opening in the spring)
Installation guides for winter pool covers recommend preparing the pool before installation (cleaning and preparing the cover).
3) Step-by-step installation (above ground / tubular)
The basic logic is always this: center → tension → fix → control water above .
Step 1 — Open and confirm size
-
Spread the tarp on the ground and check if it's the right size (with some extra fabric).
Step 2 — Place and center
-
Place it over the pool and center it (the excess should be evenly distributed).
Step 3 — Create “tilt” (optional, but very useful)
Many systems use a cushion/“pillow” in the center to create a “tent,” helping to reduce water and leaf accumulation on top. This is often mentioned in winter guides for above-ground pools.
Step 4 — Correct fixation (the crucial point in Portugal)
There are 3 common systems:
-
Cable + winch in eyelet : pass the cable through the eyelet and tighten until it is taut.
-
Special clips/clamps (depends on the pool/cover)
-
Weights / water bags + extra wind protection (most commonly used in certain types of roofing)
Windproof tip (very friendly for Portuguese speakers)
-
It reinforces the edge with a real fastening (cable/eyelet) and avoids "just landing on top".
-
In windy areas, the installation literature itself suggests reinforcements (bags/weights) and good anchoring.
4) The dangerous mistake: water accumulating on top
Pediatric safety sources warn that there should be no standing water on top of awnings and that the awning should be secured in a way that prevents a child from slipping underneath.
In practice:
-
If your tarp is solid, plan for drainage (own pump or controlled removal).
-
Keeps the tarp taut (fewer "basins" where water accumulates)
5) And what about inflatable pools?
For small/medium inflatables, many people choose to:
-
Deflate and salvage (when possible) instead of "overwintering" while assembled.
-
If it's going to be worn: use a lightweight cover with elastic + wind protection, but without creating pockets of moisture.
Quick checklist (purchase + installation)
-
Correct measurement (diameter or L×W)
-
Cover with overlap (larger than the pool)
-
Proper fastening: cable/eyelet + tensioning
-
Consider a central cushion (reduces buildup).
-
Plan for removing standing water (safety + durability)
FAQ
Does the winter cover need to be bigger than the pool?
Normally yes, to ensure overlap and secure attachment.
How can I prevent the tarp from blowing away in the wind?
Center properly, tension with cable/winch when applicable, and reinforce fastening according to the system.
Is it dangerous to leave water on the tarp?
It's possible. It's recommended to avoid standing water on top and to ensure the cover is securely fastened.