How to anchor a pergola without drilling

If there is soil anywhere near your post positions, this is the strongest thing you can do without a drill.

36 in. driven screw anchor in 356 aluminum alloy, heat treated to T6, made in the USA. Length is the whole argument. A short stake relies on friction in the top few inches of soil — the layer that softens first when it rains, which is also when the wind arrives.

The manufacturer states that the large Penetrators, 36 in. and 46 in., can be used as footings rather than only as tie-downs. That is an unusual claim in this category and it is the reason this anchor appears on a no-drill page at all: it is the one product here that is positioned as a substitute for the thing you cannot pour.

American Earth Anchors publishes pull-out charts by soil type — almost nobody else in this category publishes holding capacity at all. Read the charts rather than the headline: the figure for compact clay and the figure for loose sand are different products as far as your pergola is concerned.

Guy head, hex and flat head options. The guy head is what you want if the anchor is taking a cable rather than bolting under a post base.

It needs soil that a screw anchor will actually turn in. In rock, rubble fill or hardpan it will not, and the Arrowhead below is the answer instead.

The second driven option, for hard, stony or compacted ground, and the natural partner for a guy line.

A 3 in. steel head on a 1/8 in. galvanized steel aircraft cable, driven with a drive rod. It goes in as a spike and then rotates to sit crosswise in the soil when the cable is pulled — it is the cable that holds, not the shaft.

The manufacturer claims superior holding in hard, compact and rocky soil, which is exactly the ground that defeats a screw anchor. If you tried to turn a Penetrator in and it stopped at 6 in., this is the product that follows.

Cable clamp, thimble loop and Quickvise terminations — in plain terms, a choice of how you tie the cable off at the top, which matters when the top end is a pergola rafter rather than a tent corner.

Offered on a 36 in. or a 60 in. cable, with 3 in. to 10 in. heads in steel and aluminum. Bigger heads hold more; they also need more force to drive and are harder to retrieve.

It is a tie-down, not a footing. It stops the structure lifting. It does nothing about a post sliding sideways across a slab, so on a hard surface it belongs with ballast rather than instead of it.

Included because ballast is what most people reach for first, and because it is worth being exact about what you are buying.

Four 15 lb weights, 60 lb total, high-density polyethylene shell filled with ferro concrete, made in the United States. Sixty pounds is a meaningful amount of friction at the base of a light frame and a trivial amount of resistance to uplift on a 12 ft pergola. Both of those statements are true at once.

High-tack Velcro straps that fit square and round legs up to 2.5 in. in diameter. Measure your post before ordering. Pergola posts are frequently wider than canopy legs, and a strap that does not close is a weight resting against a post rather than attached to one.

Nothing to fill and nothing to leak. Against a sand bag, the stated weight is the weight you actually have, every time, which is the quiet reason solid ballast beats fillable ballast for a structure that stays up all season.

Designed for canopy legs, used here on a pergola post. That is an honest mismatch: these are a canopy product, and on a pergola they are a supplement to a real anchor rather than the anchoring plan.

Weight does not scale the way people expect. Resisting uplift by mass alone takes hundreds of pounds per post, not tens — see the arithmetic in the section below before you decide ballast is enough.

The option for a roof deck, a balcony or any position where getting mass to the spot is the hard part.

Four bags, each holding up to 30 lb of sand or gravel — 120 lb if you fill all four. Twice the mass of the solid set above, and it arrives empty, which is the entire point.

600D Oxford outer shell with a double-sealed polyethylene bladder inside. The bladder is what stops a wet bag weeping sand down a deck for a season. Cheaper bags trust the outer fabric alone and they do not stay full.

Fill them with gravel rather than sand if you have the choice. Sand holds water, and a saturated bag is heavier to move and slower to dry — on a deck that is a staining problem as much as a weight one.

Check the structure below before adding 120 lb per post to a balcony or roof deck. Point loads on a deck are a real engineering question and ballast creates them exactly where a post already concentrates load.

Same physical limit as every other weight. It resists sliding well. It resists lifting only in proportion to its mass, which is why nothing on this page recommends ballast on its own in an exposed position.