Index: binaries/data/mods/public/gui/common/tooltips.js
===================================================================
--- binaries/data/mods/public/gui/common/tooltips.js
+++ binaries/data/mods/public/gui/common/tooltips.js
@@ -545,7 +545,7 @@
 	let resourceCount = {};
 	for (let resource of getCostTypes())
 		if (wallTypes[0].cost[resource])
-			resourceCount[resource] = [wallTypes[0].cost[resource]];
+			resourceCount[resource] = [Math.floor(wallTypes[0].cost[resource])];
 
 	let sameTypes = true;
 	for (let i = 1; i < wallTypes.length; ++i)
@@ -561,7 +561,7 @@
 
 		for (let resource in resourceCount)
 			if (wallTypes[i].cost[resource])
-				resourceCount[resource].push(wallTypes[i].cost[resource]);
+				resourceCount[resource].push(Math.floor(wallTypes[i].cost[resource]));
 			else
 			{
 				sameTypes = false;
Index: binaries/data/mods/public/simulation/components/Cost.js
===================================================================
--- binaries/data/mods/public/simulation/components/Cost.js
+++ binaries/data/mods/public/simulation/components/Cost.js
@@ -66,7 +66,7 @@
 
 	let costs = {};
 	for (let res in this.template.Resources)
-		costs[res] = ApplyValueModificationsToTemplate("Cost/Resources/"+res, +this.template.Resources[res], owner, entityTemplate);
+		costs[res] = Math.floor(ApplyValueModificationsToTemplate("Cost/Resources/"+res, +this.template.Resources[res], owner, entityTemplate));
 
 	return costs;
 };
Index: binaries/data/mods/public/simulation/components/GuiInterface.js
===================================================================
--- binaries/data/mods/public/simulation/components/GuiInterface.js
+++ binaries/data/mods/public/simulation/components/GuiInterface.js
@@ -1540,7 +1540,7 @@
 			// TODO: we should really use a Cost object or at least some utility functions for this, this is mindless
 			// boilerplate that's probably duplicated in tons of places.
 			for (let res of Resources.GetCodes().concat(["population", "populationBonus", "time"]))
-				result.cost[res] += tplData.cost[res];
+				result.cost[res] += Math.floor(tplData.cost[res]);
 		}
 
 		let canAfford = true;