ᐅ How to Calculate the Amount of Mortar and Ytong Blocks Needed?

If I only build a single wall (brick on brick), is 17.5 cm (7 inches) thick enough, even if I want to attach wall shelves later? Or should I use thicker sand-lime bricks?

And should I apply a special plaster to the exterior walls later, or are sand-lime bricks sufficient for soundproofing, insulation, and thermal regulation at first?

Hollow calcium silicate blocks can be easily chipped away. We built several walls this way without ever needing a saw. Even the 17cm (6.7 inches) thick walls securely hold shelves. You can also use thicker ones. The installation was fast and straightforward, even for me as a non-professional builder.

Hello, sorry, but what do you mean by "tap testing"? At some point, I wouldn’t need a whole sand-lime brick anymore, but would have to cut the sand-lime brick to size. Or did I misunderstand you?

MaxMustaman92 schrieb:

Suppose you want to build a small garden shed measuring 6m x 4m (and 2.40m (7 ft 10 in) high – without the roof yet) on an existing concrete base using Ytong blocks (Ytong plan blocks 499 x 365 x 249mm (20 x 14.4 x 9.8 inches)) and later install a roller door (2632 x 2405mm (104 x 95 inches)) and a window (50 x 100cm (20 x 39 inches)).
Question:
- How do I calculate, for example, how much mortar and how many Ytong blocks I will need? I would have to include the mortar joints’ thickness in the calculation.

Only those who plan poorly have too much cutting to do. Use sand-lime bricks instead; you can even leave them unplastered, which significantly saves wall thickness (15cm (6 inches) should be enough here). The height probably won’t fit whole courses exactly, so it’s best to compensate this with the leveling course (shim layer). You don’t need to calculate the mortar volume in cubic meters; the brick manufacturers will tell you how many bags of mortar you need. For the small window (our office dog calculates mentally: that’s about four bricks), I’d recommend sizing it slightly larger. However, that will make for a rather dark space.

MaxMustaman92 schrieb:

- How large should the door and window openings be after masonry to properly install the door and window? Should you simply add 2–3cm (1 inch) extra to the opening for sealing work?

You’ll actually get the window about 2cm (1 inch) smaller than nominal size, so around 98 x 48cm (39 x 19 inches). You could save money by going with a larger one, meaning make the opening to fit the window size, allowing you to take advantage of stock or special offers. The lintel size depends on that and is easiest as a precast element or modular product. Doors are often offered for installation behind the reveal (door jamb), and the related dimensions are explained in the order catalogs.

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MaxMustaman92 schrieb:

Hello, sorry, but what do you mean by "knocking off"? At some point I wouldn’t need a whole sand-lime brick anymore, but would have to cut the sand-lime brick, right? Or did I misunderstand you?

A masonry hammer is your friend.

Ytong is not mortared, it is bonded with adhesive, which does not add thickness.

MaxMustaman92 schrieb:

I would then have to factor in the thickness of each mortar layer.