I'm a quality inspector at a formwork company. Every week I review formwork and scaffolding components before they leave for a job site. Roughly 300 line items a month, maybe more. I've been doing this for six years, and I still get the same questions: What is PERI? What are peri strips? Can you fix a stripped screw without making it worse? Here are the answers I give, in the order I usually hear them.
What is PERI?
PERI is a formwork and scaffolding systems company. We make modular wall formwork, slab formwork, shoring towers, climbing systems, and the connecting parts that make them work—tie rods, wing nuts, panels, brackets, and sealing strips. We don't pour concrete. We supply the system that shapes and supports concrete until it hardens.
What I mean is: if you're comparing formwork suppliers, don't compare just the price per panel. Compare the total package. When I review a delivery, I'm looking for certainty—the value of a promised delivery date is not speed, it's knowing that your crew won't stand around waiting. Bottom line: a good system should arrive complete, spec-compliant, and ready to set.
What are peri strips?
A PERI strip is a sealing strip fitted between formwork panels. It closes the small gap at the panel joint so concrete slurry doesn't bleed out during the pour. If a strip is missing, pinched, or the wrong thickness, you get fins, honeycomb, or a surface that needs hand-grinding before anyone will look at it.
Let me put it another way: the strip is a 10-minute fix at setup and a two-day fix after the pour. In our Q1 2024 quality audit, the most common issue on returned equipment was not cracked panels; it was missing or reused sealing strips. That's a red flag for a process problem, not a product problem. It's also the kind of thing that never shows up in a price comparison.
How do you avoid a shower valve problem before the wall is closed?
The valve itself is usually fine. The problem is the rough-in. If the height is off, the handle sits wrong. If the depth is off, the trim ring won't seat. If the pipe behind it isn't supported, you get a slow leak that opens up inside the wall.
I have mixed feelings about DIY here. On one hand, I like people understanding their own systems. On the other hand, I've been called after tile was set to look at a valve that was never verified. My rule: measure the manufacturer's rough-in spec, support the valve body, and take a photo before covering it. Five minutes of verification beats five days of correction. That said, every valve is different—check the exact model.
What is milk glass?
Milk glass is a white, translucent glass. It looks solid from one side, but light comes through. In buildings, you see it in bathroom windows, shower screens, and interior partitions where you want privacy without a dark room. It's different from clear glass with a film; the opacity is built into the material.
If you're specifying it for a shower or partition, check the impact rating and local code. My part is verifying the delivered product matches the spec—thickness, size, finish, edge treatment. Most glass problems I've seen come from ordering "like the sample" instead of writing down the requirements. If you're thinking about grandma's milk-glass collection, that's a different thing—but the same principle applies: know what you're buying before you pay.
How do I remove a stripped screw?
You stop. That's the most important step. If you keep turning a stripped screw, you'll only make it worse.
- Use the largest driver bit that fits. A worn #2 Phillips in a #3 screw is a recipe for a ruined head.
- Press down hard and turn slowly.
- If the bit still slips, try a flathead that bites into the outer edge. A rubber band between the bit and the screw can give you enough grip for minor slips.
- For stubborn cases, use a screw extractor or drill the head off.
That's the repair. The prevention is cheaper: replace the worn bit, match the driver to the fastener, and don't overtighten in the first place. I saved $8 using a worn bit once; ended up paying about $700 for a damaged panel and an extra site visit. Not my proudest math.
Peri-menopause joint pain? That's not a formwork question.
PERI the formwork company and perimenopause are two completely different searches. I understand why they collide—the word "peri" is right there. But I am not a doctor, and this article is not medical advice. If you are dealing with joint pain during the menopausal transition, please talk to a healthcare provider. Don't take construction advice for a medical issue.
I'd rather lose a reader than send someone to the wrong source. That's the same reason I review formwork: the cost of catching a problem early is small; the cost of finding it later is not.
