Best Kiln Furniture & Shelves (2026): Shelf Sizes, Posts & Kiln Wash

If you own one of the 18 inch class octagonal kilns common in home studios, this is the size class your manual is describing. Skutt's own KM-818 furniture kit uses 15 by 16 inch full shelves, and a 15 inch round fits that kiln and similar Paragon, Olympic, and Evenheat models; check your manual or the manufacturer's furniture kit listing to confirm before ordering, because a shelf an inch too large will not go in and an inch too small wastes firing space against the elements.

Why this listing over the marketplace shelves: Rainbow Art Glass is a kiln and glass supply seller with a catalog of furniture in standard sizes, which matters when you need a matching second shelf next year. Kiln wash it on one side only, label that side up, and mark it so it never gets flipped. If you are still choosing the kiln itself, our guide to the best electric kilns for home use covers the 818-class models this shelf fits.

Small kilns are where most home potters start, and the 13 inch round is the shelf those kilns want. The Skutt KM-714 and the compact Paragon and Olympic kilns with roughly 14 inch interiors run a 13 inch shelf; if you bought a small kiln to keep the electrical simple (our kiln electrical requirements guide explains why so many people do), this is the size to order two of.

A 13 inch shelf has a hidden second job in a bigger kiln. Set on posts above a 15 or 21 inch full round, it creates a partial upper level that leaves room beside it for a tall vase, which is the cheapest way to fire mixed-height loads without buying half rounds. Same care rules as any shelf: wash one face, mark it, never fire glaze-side down, and stagger posts level to level so the load runs straight down to the floor.

When a studio steps up to a 23 inch kiln, the furniture bill is the surprise, and this shelf is most of it. Skutt's own KM-1027 kit uses 22 inch half shelves, a 21 inch round fits the same kiln with a little more edge clearance, and a working load needs three or four levels, so the shelves alone add several hundred dollars to the kiln's price. Our how much does a kiln cost guide budgets for exactly this, because new owners consistently forget it.

The full round earns its place for platters, wide bowls, and tile loads where a seam between half rounds would be in the way. For everyday mixed loads, many 1027 owners run half rounds instead: lighter to lift into a deep kiln, easier to stagger for tall pieces, and half the cost to replace if one cracks. Either way, wash the top face, keep the bottom bare, and let a new shelf go through a bisque before it carries glazed work, so any moisture in the cordierite leaves before it matters.

Shelves are consumables, and buying them in pairs makes sense for a small kiln. Weysat's 13 inch 2-pack lands under the price of two supply-house singles, and the listing's 2282°F rating puts it well above cone 6, which is the ceiling for most home electric kilns. On paper it is the same shelf as the single above; in practice a marketplace brand means you are trusting the seller's rating and checking each shelf yourself.

Thickness matters more than most buyers expect. A thicker shelf resists warping over many firings and carries a heavier load without sag, at the cost of more thermal mass and slightly slower firings. For a small kiln running cone 6 glazes, thick is the right call. See our kiln cone temperature chart to confirm where your firing schedule sits against the listed rating.

Posts are the least glamorous purchase in ceramics and the one most likely to be wrong. Mismatched heights rock a shelf, and a rocking shelf cracks in the kiln. Delphi's 8-pack solves the matching problem by giving you eight identical 4 inch posts from a supply house that has sold furniture to glass and clay studios for a long time; that consistency is what you are paying for over an anonymous listing.

Four inches is the height we would buy first. It clears a mug, a cereal bowl, and most functional forms with a little air above, so it handles the majority of a home potter's levels. Build out from there: 1 inch and 2 inch posts for tile and plate levels, and 6 or 8 inch posts for vases. Use three posts per shelf in a triangle, stack them directly above the posts below so the load runs straight to the floor, and never mix heights on one level. If you are buying a full furniture set from scratch, the TSPREHFP mixed set below covers the short heights for less.

A post set does not need to be expensive, it needs to be matched, and a 12-pack in three sizes is the cheapest sensible way to start. The value here is range: short posts for tile and plate levels, mid posts for bowls, and whichever third height the listing specifies. Read the listing for the exact measurements, because the title does not state them, and buy a pack of Delphi 4 inch posts if that height is not in the set.

Use the same discipline you would with any posts: three per shelf, stacked in line with the level below, never mixed heights on one shelf. Marketplace posts occasionally vary by a hair; if a shelf rocks, swap posts until it sits dead flat rather than shimming with a chip of brick. For a small test kiln with light loads this can be the entire post inventory, and at $16 it leaves budget for the one thing every new kiln owner skips: kiln wash.

Kiln wash is the cheapest insurance in ceramics and the step new kiln owners skip most often. A thin coat on the top of every shelf means a glaze run or a boiled-over crawl chips free with a putty knife instead of welding the pot to the shelf, which usually destroys both. AMACO's four-pound carton is a common classroom choice: it mixes with water to a thin cream in a minute and a carton outlasts most kilns.

Two habits protect the investment. Keep a brush that only ever touches kiln wash, because wash in a glaze bucket ruins the glaze. And mark the washed face of every shelf with a pencil arrow so nobody loads it upside down. The flip side of that mistake, wash flaking onto glazed ware, is the reason the underside stays bare.

Stilts solve one specific problem: a piece glazed on the bottom that would otherwise fuse to the shelf. Three sharp points hold the piece off the surface so glaze can flow underneath, and after firing the tiny marks are ground smooth. It is a low-fire technique, standard in earthenware, hobby ceramics, and ornaments, and this 12-pack is the economical way to keep enough on hand for a full shelf.

The limit is temperature. Stoneware and porcelain at cone 6 and above soften enough that a stilt point sinks into the foot and the piece can slump, which is why mid-fire and high-fire potters dry-foot their work instead of stilting it. The listing does not state a cone rating, so we treat these as cone 04 to 06 tools; check your firing against our cone temperature chart before loading. Inspect points before each use and retire any stilt with a chipped tip, because a snapped point mid-firing drops the piece onto the shelf you just washed.